I'm very interested in how electronic calendars can be used to link groups of people together and provide notification of upcoming events to those groups. I continue to use and experiment with calendar services such as RSSCalendar, Eventful, and most recently Google Calendar. One question I have with these services is what's the most useful use of RSS news feeds for calendars and how do these services use RSS. Should a subscription to an ECalendar like Google's show me changes to calendar events regardless of when the event occurs (like Google's) or the actual calendar events from current to upcoming (the feed automatically updating as time moves forward, here's an RSSCalendar RSS Feed of the next 30 days TNJT shows).
Google Calendar RSS Feeds (here the RSS for the KSDS Program Schedule experiment) lists the updates to the calendar in chronological order. This would be useful to let people know when an event changes (like guests added to an upcoming radio shows) or special events are added to the calendar. This implementation of RSS is similar to an actual weblog where any updates I make show up as the most recent change to the RSS feed.
What this doesn't do is provide a mechanism for notifying someone via RSS when an event is about to start. But maybe this isn't an appropriate use for RSS and is better left to notification features of a subscriber's ECalendar.
More research into the right way to support calendar users is needed...onward!