Each year we go to the Charleston Festival in Sussex and have done every year (I think) since 1993 when I became a Trustee.   I love it:  the windy tent, the excessively knowledgeable audience, lounging about in the sun over lunch, and the magnificent unpredictability of the subjects discussed.   The pleasure is not just what happens and is said in the tent, but the beauty of the setting:  the garden looking brilliantly lush:

I sneaked inside as well: