Waylands is a favourite free party location - as are many parts of the Ridgeway

try complaining on http://www.dirtycircus.com (and see what you get for your trouble)

but to be fair, most of the crews who put parties on the Ridgeway are pretty hot on making sure it's tidy when they leave ... it can be messy before that though (what with loads of wrecked people stumbling around in the dark and all that)

are you sure that was chalk? Ketamine more likely, knowing that lot ...

RG