I remember going to a doof in gippsland in 2010 (noise poison) and cops were searching cars on the way in (unusual for the party size) because another doof at the same site 2 weeks prior had a violent incident that was blamed on GHB. It had a bad reputation amongst people I knew at doofs.
Do the dishes bit by bit. Rinse and stack, then wash a few when you make a coffee. Makes it less of task for me at least.