simplified code across the app and consolidated duplicated helpers

lib/state/app/modules/marianum_dates/bloc/marianum_dates_bloc.dart

@@ -12,20 +12,22 @@ class MarianumDatesBloc
           MarianumDatesRepository
         > {
   MarianumDatesBloc() {
-    on<SetPastEventsVisible>((event, emit) {
-      add(
+    on<SetPastEventsVisible>(
+      (event, emit) => add(
         Emit((state) => state.copyWith(showPastEvents: event.shouldBeVisible)),
-      );
-    });
+      ),
+    );
   }
 
   bool showPastEvents() => innerState?.showPastEvents ?? false;
 
-  List<MarianumDate>? getEvents() =>
-      innerState?.events
-          .where((e) => showPastEvents() || e.end.isAfter(DateTime.now()))
-          .toList() ??
-      [];
+  List<MarianumDate> getEvents() {
+    final now = DateTime.now();
+    return innerState?.events
+            .where((e) => showPastEvents() || e.end.isAfter(now))
+            .toList() ??
+        [];
+  }
 
   @override
   MarianumDatesState fromNothing() =>