The weekend of the 5th and 6th of March 2011 sees the annual Climbing Works International Festival.
It's an open to all, free to enter (normal CW entry fee applies), bouldering competition. You can go head to head with the best boulderers around. There are free physio sessions, a free BBQ on the Sunday and free after parties on both the Saturday (CWIF climbdown at ShAFF) and Sunday night (Broadfield Pub).
If you just want to watch and can't make it down to the Works it will be broadcast live on the internet from the Climbing Works website.
More information is available here:
http://www.climbingworks.com/the-beta/events/cwif-2011/