Community calendar implementation ideas:

(1) Allow each group (organic group) to maintain their own calendar. Use icalendar feeds to populate any other Drupal calendar. Perhaps leverage taxonomy to allow different subject area calendars as well. (here is a screencast of this working with Google Calendar http://growingventuresolutions.com/tutorials-and-screencasts/howto-drupal-event-module-calendars-in-google-calendar)

Events is always a challenge in Drupal. Here is a good starting point: http://groups.drupal.org/events-in-drupal

How is this different from OG Calendar? -- ChrisKennedy

We would like to implement microformats to facilate sharing and searching!

We are looking for some additional features esp in regards to crosslisting among groups. I think this applies more to the organic groups and letting events be treated as individual entities.

We would also like the ability to categorize and individually subscribe to groups.

Check email integration for the subscriptions users create.

How to handle tags and redundant tags?

specific sign up for event and volunteers (RSVP and Coordinator workflow)

Volunteer match push and pull?