I saw a request on the plugin site for dev ideas...here is mine!
I have been looking at the Events plugin which I had hoped would suit a new multi-site project I have coming up. But if I am understanding it the plugin is geared mainly towards a single user promoting their own events.
What I was after was a way that other signed in members on the site could promote their events - then link them to a site/blog on the network. A sort of Events meets directory plugin I guess?
I am not sure if this is so far removed from the plugin as it stands that it wouldn't work in its current jacket.