I happened to be walking round a quiet corner of Kew Gardens when I found this:
"Kew runs a sleepover programme called Midnight Ramblers, which began in May 2006. This unique experience allows children to explore Kew by night and helps them to understand the natural world.
At the end of their fun-packed evening they come here for stories around the campfire and to toast marshmallows..."
and to sing Stones campfire songs?