A wide brim hat to keep the sun off during setup is always nice. Eye and Ear Protection. The best safety glasses I have found are the Norton-ISO's by North. They give a wide field of view and are hard to fog up. For hearing protection the muff-type are best for the low frequency attenuation we need.
Ear plugs are a second choice.
Don't be fooled into thinking that you can protect your hearing by opening your mouth to equalize the pressure. It doesn't work. First Aid Kit. Don't go overboard, especially of you are not trained in advanced first aid. You want to be able to put a Band-Aid on a cut, that kind of thing.