BBC Proms, Albert Hall (the most beautiful venue I've ever been in), sitting in a box drinking white wine, listening to Tchaikovsky's 6th symphony.
Globe Theatre on the Thames watching Shakespeare's comedy the Merry Wives of Windsor - Fantastic.... except for that part about standing in the rain :)
Again one of the most beautiful venues I've been in and we paid 5 pounds to be there!
Then walking back home along the river we heard music coming from the shore of the Thames and discovered a random dj party for anyone who wanted to join in.
We joined in for quite a while. It was fantastic!!
When we got there, there was only a handful of people starting to dance. By the time we left there was probably a 100 or so random people grooving to great beats.