diff --git a/api/app/Services/ShiftAssignmentService.php b/api/app/Services/ShiftAssignmentService.php
index 47281a80..ef463c8c 100644
--- a/api/app/Services/ShiftAssignmentService.php
+++ b/api/app/Services/ShiftAssignmentService.php
@@ -70,10 +70,26 @@ final class ShiftAssignmentService
     public function assign(Shift $shift, Person $person, User $assignedBy): ShiftAssignment
     {
         return DB::transaction(function () use ($shift, $person, $assignedBy): ShiftAssignment {
-            $this->validateShiftIsOpen($shift);
-            $this->validateAssignCapacity($shift);
             $this->validateNoConflict($shift, $person);
 
+            // Log overbooking for audit trail (organizers may intentionally overbook)
+            $filledSlots = $shift->shiftAssignments()
+                ->where('status', ShiftAssignmentStatus::APPROVED)
+                ->count();
+
+            if ($filledSlots >= $shift->slots_total) {
+                activity('shift_assignment')
+                    ->causedBy($assignedBy)
+                    ->performedOn($shift)
+                    ->withProperties([
+                        'filled_slots' => $filledSlots,
+                        'slots_total' => $shift->slots_total,
+                        'person_id' => $person->id,
+                        'person_name' => $person->name,
+                    ])
+                    ->log('shift.overbooked_assignment');
+            }
+
             $assignment = $shift->shiftAssignments()->create([
                 'person_id' => $person->id,
                 'time_slot_id' => $shift->time_slot_id,
diff --git a/api/tests/Feature/Api/V1/ShiftAssignmentWorkflowTest.php b/api/tests/Feature/Api/V1/ShiftAssignmentWorkflowTest.php
index da303d24..7649fc7c 100644
--- a/api/tests/Feature/Api/V1/ShiftAssignmentWorkflowTest.php
+++ b/api/tests/Feature/Api/V1/ShiftAssignmentWorkflowTest.php
@@ -289,7 +289,7 @@ class ShiftAssignmentWorkflowTest extends TestCase
         $response->assertCreated();
     }
 
-    public function test_assign_rejected_when_capacity_full(): void
+    public function test_assign_allows_overbooking_when_capacity_full(): void
     {
         $shift = $this->createOpenShift(['slots_total' => 1]);
 
@@ -310,7 +310,13 @@ class ShiftAssignmentWorkflowTest extends TestCase
             ['person_id' => $this->person->id],
         );
 
-        $response->assertUnprocessable();
+        $response->assertCreated();
+
+        $this->assertDatabaseHas('shift_assignments', [
+            'shift_id' => $shift->id,
+            'person_id' => $this->person->id,
+            'status' => 'approved',
+        ]);
     }
 
     public function test_assign_rejected_with_conflict(): void
diff --git a/api/tests/Feature/Shift/ShiftTest.php b/api/tests/Feature/Shift/ShiftTest.php
index 77da9dfa..7202bfad 100644
--- a/api/tests/Feature/Shift/ShiftTest.php
+++ b/api/tests/Feature/Shift/ShiftTest.php
@@ -284,7 +284,7 @@ class ShiftTest extends TestCase
         $response->assertCreated();
     }
 
-    public function test_assign_full_shift_returns_422(): void
+    public function test_assign_full_shift_allows_overbooking(): void
     {
         $shift = Shift::factory()->create([
             'festival_section_id' => $this->section->id,
@@ -317,7 +317,13 @@ class ShiftTest extends TestCase
             'person_id' => $person2->id,
         ]);
 
-        $response->assertUnprocessable();
+        $response->assertCreated();
+
+        $this->assertDatabaseHas('shift_assignments', [
+            'shift_id' => $shift->id,
+            'person_id' => $person2->id,
+            'status' => 'approved',
+        ]);
     }
 
     public function test_claim_no_claimable_slots_returns_422(): void
diff --git a/apps/app/src/components/shifts/AssignPersonDialog.vue b/apps/app/src/components/shifts/AssignPersonDialog.vue
index 6c30b5a4..c4fb0bd0 100644
--- a/apps/app/src/components/shifts/AssignPersonDialog.vue
+++ b/apps/app/src/components/shifts/AssignPersonDialog.vue
@@ -29,6 +29,15 @@ const assignError = ref<string | null>(null)
 const showSuccess = ref(false)
 const successName = ref('')
 
+// Overbooking confirmation
+const pendingPerson = ref<AssignablePerson | null>(null)
+const showOverbookConfirm = ref(false)
+
+const isShiftFull = computed(() => {
+  if (!props.shift) return false
+  return props.shift.filled_slots >= props.shift.slots_total
+})
+
 // Clear error on filter changes
 watch([searchQuery, showOnlyAvailable, selectedCrowdType], () => {
   assignError.value = null
@@ -102,10 +111,30 @@ function getInitials(name: string) {
     .slice(0, 2)
 }
 
-async function handleAssign(person: AssignablePerson) {
+function handleAssign(person: AssignablePerson) {
   if (!props.shift) return
   assignError.value = null
 
+  if (isShiftFull.value) {
+    pendingPerson.value = person
+    showOverbookConfirm.value = true
+    return
+  }
+
+  executeAssign(person)
+}
+
+function confirmOverbook() {
+  if (pendingPerson.value) {
+    executeAssign(pendingPerson.value)
+  }
+  showOverbookConfirm.value = false
+  pendingPerson.value = null
+}
+
+async function executeAssign(person: AssignablePerson) {
+  if (!props.shift) return
+
   try {
     await assignPerson({
       sectionId: props.sectionId,
@@ -168,6 +197,18 @@ async function handleAssign(person: AssignablePerson) {
 
         <VDivider class="mb-4" />
 
+        <!-- Overbooking warning -->
+        <VAlert
+          v-if="isShiftFull"
+          type="warning"
+          variant="tonal"
+          density="compact"
+          class="mb-3"
+        >
+          <strong>Shift is vol</strong> — {{ shift.filled_slots }}/{{ shift.slots_total }}
+          plekken bezet. Je kunt nog steeds iemand toewijzen, maar de shift wordt overbezet.
+        </VAlert>
+
         <!-- Error alert -->
         <VAlert
           v-if="assignError"
@@ -352,6 +393,40 @@ async function handleAssign(person: AssignablePerson) {
     </VCard>
   </VDialog>
 
+  <!-- Overbook confirmation -->
+  <VDialog
+    v-model="showOverbookConfirm"
+    max-width="420"
+  >
+    <VCard>
+      <VCardTitle class="text-h6 pt-5 px-5">
+        Shift overbezetten?
+      </VCardTitle>
+      <VCardText class="px-5">
+        Deze shift heeft {{ shift?.slots_total }} plekken en
+        {{ shift?.filled_slots }} zijn bezet. Wil je
+        <strong>{{ pendingPerson?.name }}</strong> toch toewijzen?
+      </VCardText>
+      <VCardActions class="px-5 pb-5">
+        <VSpacer />
+        <VBtn
+          variant="tonal"
+          @click="showOverbookConfirm = false"
+        >
+          Annuleren
+        </VBtn>
+        <VBtn
+          color="warning"
+          variant="flat"
+          :loading="isAssigning"
+          @click="confirmOverbook"
+        >
+          Toch toewijzen
+        </VBtn>
+      </VCardActions>
+    </VCard>
+  </VDialog>
+
   <VSnackbar
     v-model="showSuccess"
     color="success"