bill - 5:57 am on Mar 31, 2010 (gmt 0)
Sure, this can be done. I just wasn't sure how you wanted to go about it. If you're not the technical type you could possibly get someone to write a PHP script for you that would incrementally update your RSS feed via a cron job. There are other ways as well, this is just one suggestion.
The simple solution I had in mind was to get a Google account specifically for this feed, go to the Calendar and set up annually recurring events, then subscribe to the RSS feed of the calendar.