Just in case people haven't heard, whether you're attending Drupalcon in London next week or not, ubelly have organised a Thames-based pub crawl on Tuesday evening, starting by Tower Bridge. More info at http://ubelly.com/drupalconpubcrawl
and there's also a separately organised curry night at Brick Lane.
On the Wednesday is the main Drupalcon party which for those who got tickets involves seeing the Batman Live show at the O2 Arena (tickets still on sale), then an after party at Proud2 (formerly known as Matter) within the dome also. Tickets don't seem to be available any longer for the party, though I'm not sure that means that it has sold out - hopefully it will be clarified nearer the time: http://london2011.drupal.org/page/official-drupalcon-london-party
And then on Thursday night is a Drupal-themed pub quiz in Croydon (where the main event is) at 9pm: http://london2011.drupal.org/page/drupal-trivia-night
More information on Drupal London itself is at http://london2011.drupal.org
I hope this information is useful for everyone who attends Drupal community events in London :-)
Drupal freelancer, and PHP London, PHP UK Conference and Facebook Developer Garage London organiser