I celebrated it. I got powerfully drunk and lay in the garden until my skin started to sizzle.
Unfortunately I could't get down to Stonehenge and skip around the stones with the Pagans and assorted druid-type fruitbats. I makes me laugh, druids have about as much relation to Stonehenge as I do with the fall of the third reich. Still, I think banging a few drums and free love (yes, I know nothing about Paganism beyond my bigotry) sounds good to me.