I was over at WKLB today and checked out the wet stone - it wasn't raining today but has been recently so the hot conditions of our late summer didn't apply. The stone was of course still wet and the friend I was with said that it may be partly due to condensation - apparently sarsen sweats and houses built with sarsen are usually damp.

I'll just mention the two groups of activities going on in the short while I was there:
A group of people drumming and laying down rosemary (evidence of incense burning) - they were leaving as we arrived. And a group of school kids ages around ten, with their teacher. They were striking pieces of flint together to make sparks.