Laravel 5.2 Policy for Create and Store Won't Authorize using Event::class

It seems like the previous version of Laravel that you could pass the class name as a string to authorize: $this->authorize('store', Event::class);, but this now returns Type error: Argument 2 passed to App\Policies\EventPolicy::store() must be an instance of App\Event, string given. Is it possible to set a policy on index, create, and store in Laravel 5.2? I'm trying to do this to authorize whether a user can actually create a new event or not.

/**
 * Determine if the given user can create an event based on users only
 * being allowed to create a single event each.
 *
 * @param User $user
 *
 * @return bool
 */
public function store(User $user)
{
    return $user->events()->isEmpty();
}

via Chebli Mohamed