I should add that there are other types of toilets, not just composting toilets, that might be considered for this kind of venue. Some of them have a setup for quick drying and burning of waste. A friend who lives out in the rural west (U.S.) has one of these--he said the main problems with his are when people arrive who don't pay attention to the instructions on how to use it. If that is the case, then you need a very savvy crowd to keep the enviro-toilet up and running.