fix enrollment for the new school-year

app/Controllers/View/EventController.php

@@ -92,6 +92,13 @@ class EventController extends ResourceController
         return $this->eventChargesHasCreatedBy;
     }
 
+    private function assertSchoolYearNameWritable(string $schoolYear): void
+    {
+        service('schoolYearWriteGuard')->assertWritable(
+            service('schoolYearContext')->forYearName($schoolYear)
+        );
+    }
+
     private function currentSchoolYearName(): string
     {
         try {
@@ -939,6 +946,7 @@ class EventController extends ResourceController
         if (!$charge) {
             return redirect()->to($returnTo)->with('error', 'Charge not found.');
         }
+        $this->assertSchoolYearNameWritable((string)($charge['school_year'] ?? ''));
 
         $paymentId = (int)($charge['event_payment_id'] ?? 0);
         if ($paymentId > 0) {
@@ -989,6 +997,7 @@ class EventController extends ResourceController
         if (!$charge) {
             return redirect()->to($returnTo)->with('error', 'Charge not found.');
         }
+        $this->assertSchoolYearNameWritable((string)($charge['school_year'] ?? ''));
 
         $signed = $this->request->getPost('waiver_signed') === '1';
 
@@ -1070,6 +1079,7 @@ class EventController extends ResourceController
         if (!$charge) {
             return null;
         }
+        $this->assertSchoolYearNameWritable((string)($charge['school_year'] ?? ''));
 
         $event = $this->eventModel->find($charge['event_id']);
         $eventAmount = max(0.0, (float)($event['amount'] ?? 0));