Event descriptions should be wiki pages like feature pages. An event page consists mainly of a title, a description and a date. The description and title are already covered on vanilla wiki pages. Having a date added to the mix calls for special treatment for event pages, more special than that given to feature pages.

Feature pages are (at the present moment) just wiki pages that are marked (tagged) as feature suggestions. Event pages need more than that. When editing an event page, there should be shown an extra field for the date. Maybe it even should be shown as soon as the page is classified as an event page via an asynchronous server call.