24-25 April 2010, A full, weekend long (including overnight) BarCamp Cambridge. Details to follow on http://barcamb.org/. You can also follow @barcamb on twitter for more details.
Note: there is google discussion group, but it doesn't seem to be accepting messages currently: YMMV: http://groups.google.com/group/barcamb
Previous unconferences in cambridge
There have been two previous "barcamps" in cambridge (UK), which were 1 day events.
2008: Friday 1st August.
2007: Details of BarCamb 2007.