BuddyPress.org

There is also this commercial (€59,50) plugin buddyvents. But the testsite (http://test.shabushabu.eu/events/) shows up a lot of warnings which makes me think that the software is not stable (screenshot: http://i52.tinypic.com/5ydv0g.png).
So, yes you are right. There are some event plugins out there but none of them seems to be a good event solution. I used to think that eventpress had the best potential but it has not much evolved since the launch.