PS.: of course the Wiki-Pages may have whatever format that suits to serve as a feed source.
PPS.: This would be the first step to a collaboratively editable calender supporting tags - tag choice (and exclusions) can be used to create individual ICAL feeds containing only what you want out of the database.
(To those who speak deutsche Sprache: die Oberseite der o.g. Links beschreibt das Konzept im Detail.)
Please comment just anything, even if you see no chance to realize the idea!