feat: add events app + "multi-tenants" aka multi-events

polylan_submitter/submissions/migrations/0005_submission_event_required.py

@@ -0,0 +1,20 @@
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("submissions", "0004_backfill_submission_event"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="submission",
+            name="event",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="submissions",
+                to="events.event",
+            ),
+        ),
+    ]