diff --git a/ERD.md b/ERD.md
new file mode 100644
index 0000000..b1bb0cf
--- /dev/null
+++ b/ERD.md
@@ -0,0 +1,151 @@
+# Entity Relationship Diagram
+
+```mermaid
+erDiagram
+    Tenant ||--o{ TenantUserRole : has
+    Tenant ||--o{ InteractionType : defines
+    Tenant ||--o{ DonationMethod : defines
+    Tenant ||--o{ ElectionType : defines
+    Tenant ||--o{ EventType : defines
+    Tenant ||--o{ ParticipationType : defines
+    Tenant ||--o{ Voter : belongs_to
+    Tenant ||--o{ Event : organizes
+
+    User ||--o{ TenantUserRole : assigned_to
+
+    Voter ||--o{ VotingRecord : has
+    Voter ||--o{ EventParticipation : participates
+    Voter ||--o{ Donation : makes
+    Voter ||--o{ Interaction : receives
+    Voter ||--o{ VoterLikelihood : has
+
+    Event ||--o{ EventParticipation : includes
+    EventType ||--o{ Event : categorizes
+
+    InteractionType ||--o{ Interaction : categorizes
+    DonationMethod ||--o{ Donation : categorizes
+    ElectionType ||--o{ VoterLikelihood : categorizes
+    ParticipationType ||--o{ EventParticipation : categorizes
+
+    Tenant {
+        int id PK
+        string name
+        string slug
+        text description
+        datetime created_at
+    }
+
+    User {
+        int id PK
+        string username
+        string email
+        string first_name
+        string last_name
+    }
+
+    TenantUserRole {
+        int id PK
+        int user_id FK
+        int tenant_id FK
+        string role
+    }
+
+    InteractionType {
+        int id PK
+        int tenant_id FK
+        string name
+        boolean is_active
+    }
+
+    DonationMethod {
+        int id PK
+        int tenant_id FK
+        string name
+        boolean is_active
+    }
+
+    ElectionType {
+        int id PK
+        int tenant_id FK
+        string name
+        boolean is_active
+    }
+
+    EventType {
+        int id PK
+        int tenant_id FK
+        string name
+        boolean is_active
+    }
+
+    ParticipationType {
+        int id PK
+        int tenant_id FK
+        string name
+        boolean is_active
+    }
+
+    Voter {
+        int id PK
+        int tenant_id FK
+        string voter_id
+        string first_name
+        string last_name
+        text address
+        string phone
+        string email
+        string district
+        string precinct
+        date registration_date
+        string candidate_support
+        string yard_sign
+        datetime created_at
+    }
+
+    VotingRecord {
+        int id PK
+        int voter_id FK
+        date election_date
+        string election_description
+        string primary_party
+    }
+
+    Event {
+        int id PK
+        int tenant_id FK
+        date date
+        int event_type_id FK
+        text description
+    }
+
+    EventParticipation {
+        int id PK
+        int event_id FK
+        int voter_id FK
+        int participation_type_id FK
+    }
+
+    Donation {
+        int id PK
+        int voter_id FK
+        date date
+        int method_id FK
+        decimal amount
+    }
+
+    Interaction {
+        int id PK
+        int voter_id FK
+        int type_id FK
+        date date
+        string description
+        text notes
+    }
+
+    VoterLikelihood {
+        int id PK
+        int voter_id FK
+        int election_type_id FK
+        string likelihood
+    }
+```
\ No newline at end of file
diff --git a/core/__pycache__/admin.cpython-311.pyc b/core/__pycache__/admin.cpython-311.pyc
index c60c979..b6b7208 100644
Binary files a/core/__pycache__/admin.cpython-311.pyc and b/core/__pycache__/admin.cpython-311.pyc differ
diff --git a/core/__pycache__/models.cpython-311.pyc b/core/__pycache__/models.cpython-311.pyc
index 2c3fe0d..887c76e 100644
Binary files a/core/__pycache__/models.cpython-311.pyc and b/core/__pycache__/models.cpython-311.pyc differ
diff --git a/core/admin.py b/core/admin.py
index ddcba09..1f6d628 100644
--- a/core/admin.py
+++ b/core/admin.py
@@ -1,7 +1,8 @@
 from django.contrib import admin
 from .models import (
-    Tenant, TenantUserRole, InteractionType, DonationMethod, ElectionType, EventType, Voter,
-    VotingRecord, Event, EventParticipation, Donation, Interaction, VoterLikelihood
+    Tenant, TenantUserRole, InteractionType, DonationMethod, ElectionType, EventType,
+    ParticipationType, Voter, VotingRecord, Event, EventParticipation, Donation,
+    Interaction, VoterLikelihood
 )
 
 class TenantUserRoleInline(admin.TabularInline):
@@ -44,6 +45,12 @@ class EventTypeAdmin(admin.ModelAdmin):
     list_filter = ('tenant', 'is_active')
     search_fields = ('name',)
 
+@admin.register(ParticipationType)
+class ParticipationTypeAdmin(admin.ModelAdmin):
+    list_display = ('name', 'tenant', 'is_active')
+    list_filter = ('tenant', 'is_active')
+    search_fields = ('name',)
+
 class VotingRecordInline(admin.TabularInline):
     model = VotingRecord
     extra = 1
@@ -74,5 +81,5 @@ class EventAdmin(admin.ModelAdmin):
 
 @admin.register(EventParticipation)
 class EventParticipationAdmin(admin.ModelAdmin):
-    list_display = ('voter', 'event')
-    list_filter = ('event__tenant', 'event')
+    list_display = ('voter', 'event', 'participation_type')
+    list_filter = ('event__tenant', 'event', 'participation_type')
\ No newline at end of file
diff --git a/core/migrations/0005_participationtype_and_more.py b/core/migrations/0005_participationtype_and_more.py
new file mode 100644
index 0000000..d89b0b9
--- /dev/null
+++ b/core/migrations/0005_participationtype_and_more.py
@@ -0,0 +1,31 @@
+# Generated by Django 5.2.7 on 2026-01-24 15:43
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0004_remove_voter_geocode_donationmethod_is_active_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ParticipationType',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
+                ('is_active', models.BooleanField(default=True)),
+                ('tenant', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='participation_types', to='core.tenant')),
+            ],
+            options={
+                'unique_together': {('tenant', 'name')},
+            },
+        ),
+        migrations.AddField(
+            model_name='eventparticipation',
+            name='participation_type',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='core.participationtype'),
+        ),
+    ]
diff --git a/core/migrations/__pycache__/0005_participationtype_and_more.cpython-311.pyc b/core/migrations/__pycache__/0005_participationtype_and_more.cpython-311.pyc
new file mode 100644
index 0000000..557418f
Binary files /dev/null and b/core/migrations/__pycache__/0005_participationtype_and_more.cpython-311.pyc differ
diff --git a/core/models.py b/core/models.py
index 92d0a64..cd5acd0 100644
--- a/core/models.py
+++ b/core/models.py
@@ -41,7 +41,7 @@ class InteractionType(models.Model):
         unique_together = ('tenant', 'name')
 
     def __str__(self):
-        return f"{self.name} ({self.tenant.name})"
+        return self.name
 
 class DonationMethod(models.Model):
     tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='donation_methods')
@@ -52,7 +52,7 @@ class DonationMethod(models.Model):
         unique_together = ('tenant', 'name')
 
     def __str__(self):
-        return f"{self.name} ({self.tenant.name})"
+        return self.name
 
 class ElectionType(models.Model):
     tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='election_types')
@@ -63,7 +63,7 @@ class ElectionType(models.Model):
         unique_together = ('tenant', 'name')
 
     def __str__(self):
-        return f"{self.name} ({self.tenant.name})"
+        return self.name
 
 class EventType(models.Model):
     tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='event_types')
@@ -74,7 +74,18 @@ class EventType(models.Model):
         unique_together = ('tenant', 'name')
 
     def __str__(self):
-        return f"{self.name} ({self.tenant.name})"
+        return self.name
+
+class ParticipationType(models.Model):
+    tenant = models.ForeignKey(Tenant, on_delete=models.CASCADE, related_name='participation_types')
+    name = models.CharField(max_length=100)
+    is_active = models.BooleanField(default=True)
+
+    class Meta:
+        unique_together = ('tenant', 'name')
+
+    def __str__(self):
+        return self.name
 
 class Voter(models.Model):
     SUPPORT_CHOICES = [
@@ -127,6 +138,7 @@ class Event(models.Model):
 class EventParticipation(models.Model):
     event = models.ForeignKey(Event, on_delete=models.CASCADE, related_name='participations')
     voter = models.ForeignKey(Voter, on_delete=models.CASCADE, related_name='event_participations')
+    participation_type = models.ForeignKey(ParticipationType, on_delete=models.SET_NULL, null=True, blank=True)
 
     def __str__(self):
         return f"{self.voter} at {self.event}"
@@ -164,4 +176,4 @@ class VoterLikelihood(models.Model):
         unique_together = ('voter', 'election_type')
 
     def __str__(self):
-        return f"{self.voter} - {self.election_type}: {self.get_likelihood_display()}"
+        return f"{self.voter} - {self.election_type}: {self.get_likelihood_display()}"
\ No newline at end of file