a2cal is a calendar of events in and around Ann Arbor. It has been designed by and is maintained by University of Michigan alumnus Jon Udell, who maintains a similar calendar for Keene, New Hampshire.

a2cal aggregates calendar information from a variety of sources including iCal based calendars.

http://elmcity.blob.core.windows.net/a2cal/a2cal.html

Project homepage for Elm City: http://elmcity.cloudapp.net/