Whether you want to watch the next Banksy, are the next Banksy or, indeed, are Banksy, a passage running under Waterloo station will be the place to be on Saturday as dozens of graffiti artists come together for a battle royale.
London has marked out some of the last year's biggest events with a choice graffito or two. Who can forget the images which greeted the Pope at the Royal College Of Art or in Shoreditch while Village Underground pleaded with us to "Don't Hate On Kate" and Southbank unveiled a "punk" version of the happy couple.
The event itself takes place outside one of the exits of co-sponsors the ubercool Old Vic Tunnels. Leake Street is the location of a legal graffiti wall, albeit with rules including "You don't have to be a gangster to paint here so don't behave like one". A selection of the street's graffiti can be seen here.
Artists have from 9am to 8pm to create their work using a maximum of four metres, which presumably refers to width (so bring a stepladder or someone to stand on for maximum effect). The works will be judged on "letterform, fill-in, characters, concept and background". They must collect their free cans from spray paint specialists Chrome & Black by today ("no exceptions").
If the shorter members of your family are miffed about the postponement of last week's family-friendly Meeting Of Styles Graffiti Festival, there will also be a free graffiti workshop for under-12s from 1pm-5pm.
For more information, see here.
Don't know your Eine from your Tox? We recommend the Street Art tour.
Want to know more about London's great street art? We have more articles on the subject than you can shake a spraycan at.