at strawberry some folks rent huge octagonal tents to have their space to jam in. sometimes it rains or snows during the twice annual festival and it is good to be able to have a heated space. and a place you can light up for all night jams...often elabortate candle chandeliers/candeabras are invented with test-tubes or other glass holders for candles to shed light on the subject...they rent these tent from somebody...one business which has these available is calle Life's Best In Tents....or some thing like that...we have alos tossed around the idea of each participant bringing a bale of hay to make an enclosure in which to sequester the drum circle folks...to insulate the rest of us fro their incessant pounding...sorry if you are a percussionist.....