WEBSITE: TimeOut London by shutterlust
http://www.timeout.com/london/TimeOut London is the sister magazine/website to TimeOut New York. It is the place you go to find out what's going out in London, from concerts, clubs, social/community events, parades, and whatever else is going on in London! It's a fantastic site/magazine that everyone who visits London must visit/purchase to see what local events they can participate in. I've found out about several street fairs, local parades, even hotel suggestions from TimeOut. It's incredibly helpful and I highly suggest you use it as a resource when visiting London.