public function makeResponsible(Event $event, User $user)
    {
        $this->authorize('update', $event);
        $event->addResponsible($user);

        return redirect()->route('laralum::events.show', ['event' => $event->id])
            ->with('success', __('laralum_events::general.responsible_added', ['event_id' => $event->id, 'user_id' => $user->id]));
    }