The CANS Festival, a street party of stencil art, is happening this Bank Holiday weekend in London. It will be in a half-mile stretch of tunnel in Leake Street, London from 10am Saturday 3 May to 10pm Monday 5 May 2008. Admission is free. It is an open event so visitors are encouraged to join in though it is limited to stencils only.
UPDATE: Here's a video of the show...
Links to some of the confirmed artists are below.
The Cans Festival
BsAsStencil(Buenos Aires Stencil)
Tom Civil (Civilian)
3D Del Naja
vhils (Alexandre Farto)
Dr. Case's Photostream