This plugin allows group members and moderators to create and manage events for display in a group calendar, as well as globally across the site.
Features:
The BuddyPress Group Calender plugin offers the ability for groups to coordinate and organize events.
There are unlimited uses for this functionality, including practices, festivals, performance schedules, business promotions, networking, learning management systems, markets, corporate events, etc.
While creating new events, the user can see upcoming events that are scheduled for that specific group, as well as scroll ahead by month or year.
Past events can be left on the calendar or users can delete them.
More info: http://premium.wpmudev.org/project/buddypress-group-calendar