oh gosh we forgot the bathrooms...there is probably nothing more important. They probably should be manned/womaned by volunteers right there...who can call for plumbing help, make sure supplies are sufficient,and do minor cleanup. Major cleaning should be arranged for the professional staff to be paid overtime or whatever it takes to clean it thoroughly every few hours. If you have to use Porta Potties, heaven forbid, make sure they are clean and replaced nightly or however they do it.

Lots of water around. Shade provided via awnings etc. mg