When I was packing up our camera gear in the morning, I found a yellow rave book at the front of the stage.
I was honestly going to leave it, but Katy (the girl who was shooting the documentary) guilted me into trying to find its owner.
Anyway, from what I can tell, the owner's name is Niam (Nieve to anyone who is unfamiliar with Irish names).
If anyone knows whose this is, I'd be happy to try and return it to them. Otherwise it goes into the bag in my garage with all the lost stuff from the DIY parties.