One of the difficulties with managing public calendars is the different levels of access control. It seems that the person who needs to add an event to a public calendar is never the person who has editor access to that calendar. As a result, users have to track down the administrator to manage editor rights on a case-by-case basis. The administrator may end up taking the simple approach of making everyone an editor to the calendar. But this approach can result in users editing events that are not their own as well as increasing the chance of synchronization inconsistencies.