Date: 2008 March 04 13:07
Posted by Azure
The Guiness book of records is planning to try and break the record for biggest number of people dressed as games characters in London on March the 18th at 11am. To take part you need to e-mail them via the address on their site and tell them who you will be cosplaying as and they will confirm the venue.
The site does mention anime fans, so we're guessing they'll allow you to enter your anime costumes if they've been in a game.
They'll be a lot of ninjas then.