It would be handy to have a list of icons to add to an event to denote the event type (meeting, vacation, project milestone, launch date, etc.) This way, users of the calendar could see at a glance what the event is. I see this as a pop-up menu, very much like inserting an emoticon in a Confluence page.
I'm looking for something like "event flair" that's currently available in Google Calendar (currently a feature you must enable in Google Labs). See attached for screenshots.