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It would be neat to have a user-editable and -addable event calendar, so those involved in content creation can post dates/times of events. I am myself part of a team producing a weekly internet radio show, and that would be a good example of the sort of event to go into such a calendar. IRL events would IMHO also benefit. Notifications, subscriptions, etc.–the required WordPress plugins are already out there 😉
IMHO, such a feature would make for more community interaction, i.e., members talking to one another (if only about how to get to the shoutcast stream or similar…)