/**
* Returns FALSE, if the user can join the event right away
* Return TRUE, if the user has to wait a certain amount of days in order to sign up for the event
* Also returns TRUE if the user has no access to this event's topic, or if no user or event with such ID exist
*
* @param int $userID
* @param int $eventID
* @return boolean
*/
public static function hasToWait($userID, $eventID)
{
$event = EventDatabaseManager::getEvent($eventID);
return EventDatabaseManager::daysTillAbleToJoin($userID, $event->getTopicID()) > 0;
}