Salvete! I have a calendar with one overlay. When I go to view the RSS feed, it is blank - that is, there are no entries at all.
Now, for the calendar, RSS is enabled. For the site, RSS is enabled. I can view the RSS feeds of other lists on the same site - no problem. The RSS is generated, but no entries are in it.
Am I missing something? Shouldn't the RSS for a calendar produce entries? Is there any way to get a clue as to what is happening?