Create a Wiki based platform for places, organizations, and events to be easily accessible to the Cleveland area, primarily through Google Maps.
A couple of years ago, I tried to organize the creation of wiki.cleveland.com. It generated some interest, and I talked to some people about it. But I ultimately wasn't able to attract the attention of the people necessary.
Focusing on events, though, is a crowded area. Upcoming and Meetup.com have the most people. The Cleveland Web Standards group cross-lists their events to both (here and here) and the Cleveland Bloggers group uses meetup.com here.