What to bring to a cycling event?

We've been to a lot of cycling events over the years and we started off bringing an entire carload of stuff. Now, we're down to just the essentials. Water, money, sunscreen, cowbells, hats and good walking shoes. On occasion we'll bring a few light-weight, folding seats that you would use for camping or hunting. You can find them at Sportsman's Warehouse for $15 and they have storage underneath for your water and sunscreen.They even have straps to wear it like a backpack.