Last night I went to Critical Mass - it was fairly quiet but regulars were there. Didn't get rained on, which was good.
No bike polo however (Which is moderately dangerous and I'm rubbish at) - but we did see an interesting, erm, thing for Cowley Road Carnival. Some chaps in East Oxford have built a spider-bike - giant spider on top of a frame with three bikes underneath. It animates as it goes along. The middle rider operates the spider and steering, the two back riders provide power.
Upcoming events: Apparently there is a Perl programmers meeting in Reading on 10th July somewhere - I'll post more details when I have them.