There was a London one last year too IIRC, or maybe it was the year before that?

The first London one had me Hampa & Gman at it for a Nintendo Wiiware event in 2009. So yeah, that one was an "official" one if you can call it that.
Also had a Nuthug, rutz, harl, rafufu & strangelove; got drunk & make fools of ourselves. Pretty fun.

Ye olde news thread about it