diff --git a/Core/Entities/EventOccurrence.cs b/Core/Entities/EventOccurrence.cs
index c171b18..1bf82d3 100644
--- a/Core/Entities/EventOccurrence.cs
+++ b/Core/Entities/EventOccurrence.cs
@@ -1,14 +1,22 @@
-
-namespace Core.Entities
+namespace Core.Entities
 {
 	public class EventOccurrence
 	{
+		public int Id { get; set; }
+		
+		public int? EventDefinitionId { get; set; }
+		
+		public string? SpecialEventType { get; set; }
+		
 		public string Name { get; set; } = null!;
 		public string Time { get; set; } = null!;
 		public string Date { get; set; } = null!;
 		public DateTime StartTime { get; set; }
 		public DateTime? EndTime { get; set; }
-		public string Location { get; set; } = null!;
+		public string? Location { get; set; }
+
+		// Navigation property
+		public EventDefinition? EventDefinition { get; set; }
 
 		public bool SignupSubmitPickup =>
 			Name.Contains("Sign-up") ||
diff --git a/Data/AppDbContext.cs b/Data/AppDbContext.cs
index f6ca913..bf52323 100644
--- a/Data/AppDbContext.cs
+++ b/Data/AppDbContext.cs
@@ -10,6 +10,7 @@ namespace Data
         public DbSet<Student> Students { get; set; }
         public DbSet<Team> Teams { get; set; }
         public DbSet<StudentEventRanking> StudentEventRanking { get; set; }
+        public DbSet<EventOccurrence> EventOccurrences { get; set; }
 
         public AppDbContext()
         {
diff --git a/Data/Configurations/EventOccurrenceConfiguration.cs b/Data/Configurations/EventOccurrenceConfiguration.cs
new file mode 100644
index 0000000..ceaa5ad
--- /dev/null
+++ b/Data/Configurations/EventOccurrenceConfiguration.cs
@@ -0,0 +1,48 @@
+using Core.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Data.Configurations
+{
+    public class EventOccurrenceConfiguration : IEntityTypeConfiguration<EventOccurrence>
+    {
+        public void Configure(EntityTypeBuilder<EventOccurrence> builder)
+        {
+            builder.HasKey(e => e.Id);
+
+            // Indexes
+            builder.HasIndex(e => e.StartTime);
+            builder.HasIndex(e => e.EventDefinitionId);
+            builder.HasIndex(e => e.SpecialEventType);
+
+            // Foreign key relationship (optional)
+            builder.HasOne(e => e.EventDefinition)
+                .WithMany()
+                .HasForeignKey(e => e.EventDefinitionId)
+                .OnDelete(DeleteBehavior.Restrict); // Don't cascade delete if EventDefinition is deleted
+
+            // Constraints
+            builder.Property(e => e.Name)
+                .IsRequired()
+                .HasMaxLength(200);
+
+            builder.Property(e => e.Time)
+                .IsRequired()
+                .HasMaxLength(100);
+
+            builder.Property(e => e.Date)
+                .IsRequired()
+                .HasMaxLength(100);
+
+            builder.Property(e => e.Location)
+                .HasMaxLength(500);
+
+            builder.Property(e => e.SpecialEventType)
+                .HasMaxLength(50);
+
+            // Validation: Either EventDefinitionId OR SpecialEventType must be set (enforced at application level)
+            // EF Core doesn't support mutually exclusive constraints directly, so we'll handle this in validation attributes or service layer
+        }
+    }
+}
+
diff --git a/Data/Migrations/20251227205816_EventOccurrence.Designer.cs b/Data/Migrations/20251227205816_EventOccurrence.Designer.cs
new file mode 100644
index 0000000..e382738
--- /dev/null
+++ b/Data/Migrations/20251227205816_EventOccurrence.Designer.cs
@@ -0,0 +1,339 @@
+// <auto-generated />
+using System;
+using Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace Data.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20251227205816_EventOccurrence")]
+    partial class EventOccurrence
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "9.0.8");
+
+            modelBuilder.Entity("Core.Entities.EventDefinition", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("ChapterEligibilityCountRegionals")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("ChapterEligibilityCountState")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(1000)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Documentation")
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Eligibility")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("EventFormat")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("LevelOfEffort")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("MaxTeamSize")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("MinTeamSize")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(1024)
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("OnSiteActivity")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("Presubmission")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("SemifinalistActivity")
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("ShortName")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Theme")
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EventFormat");
+
+                    b.HasIndex("Name")
+                        .IsUnique();
+
+                    b.ToTable("Events");
+                });
+
+            modelBuilder.Entity("Core.Entities.EventOccurrence", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Date")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime?>("EndTime")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("EventDefinitionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Location")
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("SpecialEventType")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("StartTime")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Time")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EventDefinitionId");
+
+                    b.HasIndex("SpecialEventType");
+
+                    b.HasIndex("StartTime");
+
+                    b.ToTable("EventOccurrences");
+                });
+
+            modelBuilder.Entity("Core.Entities.Student", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(255)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("FirstName")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("Grade")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("LastName")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("NationalId")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("OfficerRole")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("PhoneNumber")
+                        .HasMaxLength(20)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("RegionalId")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("StateId")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("TsaYear")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Email");
+
+                    b.HasIndex("Grade");
+
+                    b.HasIndex("FirstName", "LastName");
+
+                    b.ToTable("Students");
+                });
+
+            modelBuilder.Entity("Core.Entities.StudentEventRanking", b =>
+                {
+                    b.Property<int>("StudentId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("EventDefinitionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("Rank")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("StudentId", "EventDefinitionId");
+
+                    b.HasIndex("EventDefinitionId");
+
+                    b.HasIndex("Rank");
+
+                    b.HasIndex("StudentId");
+
+                    b.ToTable("StudentEventRanking");
+                });
+
+            modelBuilder.Entity("Core.Entities.Team", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int?>("CaptainId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("EventId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Identifier")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CaptainId");
+
+                    b.HasIndex("EventId");
+
+                    b.HasIndex("EventId", "Identifier");
+
+                    b.ToTable("Teams");
+                });
+
+            modelBuilder.Entity("StudentTeam", b =>
+                {
+                    b.Property<int>("StudentsId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("TeamsId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("StudentsId", "TeamsId");
+
+                    b.HasIndex("TeamsId");
+
+                    b.ToTable("TeamStudents", (string)null);
+                });
+
+            modelBuilder.Entity("Core.Entities.EventOccurrence", b =>
+                {
+                    b.HasOne("Core.Entities.EventDefinition", "EventDefinition")
+                        .WithMany()
+                        .HasForeignKey("EventDefinitionId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("EventDefinition");
+                });
+
+            modelBuilder.Entity("Core.Entities.StudentEventRanking", b =>
+                {
+                    b.HasOne("Core.Entities.EventDefinition", "EventDefinition")
+                        .WithMany()
+                        .HasForeignKey("EventDefinitionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Core.Entities.Student", "Student")
+                        .WithMany("EventRankings")
+                        .HasForeignKey("StudentId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("EventDefinition");
+
+                    b.Navigation("Student");
+                });
+
+            modelBuilder.Entity("Core.Entities.Team", b =>
+                {
+                    b.HasOne("Core.Entities.Student", "Captain")
+                        .WithMany()
+                        .HasForeignKey("CaptainId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Core.Entities.EventDefinition", "Event")
+                        .WithMany()
+                        .HasForeignKey("EventId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("Captain");
+
+                    b.Navigation("Event");
+                });
+
+            modelBuilder.Entity("StudentTeam", b =>
+                {
+                    b.HasOne("Core.Entities.Student", null)
+                        .WithMany()
+                        .HasForeignKey("StudentsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Core.Entities.Team", null)
+                        .WithMany()
+                        .HasForeignKey("TeamsId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Core.Entities.Student", b =>
+                {
+                    b.Navigation("EventRankings");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/Data/Migrations/20251227205816_EventOccurrence.cs b/Data/Migrations/20251227205816_EventOccurrence.cs
new file mode 100644
index 0000000..5767f69
--- /dev/null
+++ b/Data/Migrations/20251227205816_EventOccurrence.cs
@@ -0,0 +1,63 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class EventOccurrence : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "EventOccurrences",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    EventDefinitionId = table.Column<int>(type: "INTEGER", nullable: true),
+                    SpecialEventType = table.Column<string>(type: "TEXT", maxLength: 50, nullable: true),
+                    Name = table.Column<string>(type: "TEXT", maxLength: 200, nullable: false),
+                    Time = table.Column<string>(type: "TEXT", maxLength: 100, nullable: false),
+                    Date = table.Column<string>(type: "TEXT", maxLength: 100, nullable: false),
+                    StartTime = table.Column<DateTime>(type: "TEXT", nullable: false),
+                    EndTime = table.Column<DateTime>(type: "TEXT", nullable: true),
+                    Location = table.Column<string>(type: "TEXT", maxLength: 500, nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_EventOccurrences", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_EventOccurrences_Events_EventDefinitionId",
+                        column: x => x.EventDefinitionId,
+                        principalTable: "Events",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_EventOccurrences_EventDefinitionId",
+                table: "EventOccurrences",
+                column: "EventDefinitionId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_EventOccurrences_SpecialEventType",
+                table: "EventOccurrences",
+                column: "SpecialEventType");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_EventOccurrences_StartTime",
+                table: "EventOccurrences",
+                column: "StartTime");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "EventOccurrences");
+        }
+    }
+}
diff --git a/Data/Migrations/AppDbContextModelSnapshot.cs b/Data/Migrations/AppDbContextModelSnapshot.cs
index e3c7d3b..9c3ecfb 100644
--- a/Data/Migrations/AppDbContextModelSnapshot.cs
+++ b/Data/Migrations/AppDbContextModelSnapshot.cs
@@ -1,4 +1,5 @@
 // <auto-generated />
+using System;
 using Data;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -93,6 +94,55 @@ namespace Data.Migrations
                     b.ToTable("Events");
                 });
 
+            modelBuilder.Entity("Core.Entities.EventOccurrence", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Date")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime?>("EndTime")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int?>("EventDefinitionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Location")
+                        .HasMaxLength(500)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(200)
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("SpecialEventType")
+                        .HasMaxLength(50)
+                        .HasColumnType("TEXT");
+
+                    b.Property<DateTime>("StartTime")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Time")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EventDefinitionId");
+
+                    b.HasIndex("SpecialEventType");
+
+                    b.HasIndex("StartTime");
+
+                    b.ToTable("EventOccurrences");
+                });
+
             modelBuilder.Entity("Core.Entities.Student", b =>
                 {
                     b.Property<int>("Id")
@@ -214,6 +264,16 @@ namespace Data.Migrations
                     b.ToTable("TeamStudents", (string)null);
                 });
 
+            modelBuilder.Entity("Core.Entities.EventOccurrence", b =>
+                {
+                    b.HasOne("Core.Entities.EventDefinition", "EventDefinition")
+                        .WithMany()
+                        .HasForeignKey("EventDefinitionId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("EventDefinition");
+                });
+
             modelBuilder.Entity("Core.Entities.StudentEventRanking", b =>
                 {
                     b.HasOne("Core.Entities.EventDefinition", "EventDefinition")