My trick was to start as early as possible in the morning. I’d ride pretty hard until it started warming up, then slow down and take more breaks later in the day.
Looking at an Iowa weather forecast (this week), the temperature doesn’t peak until 4 or 5 pm. I should be in camp with a cold drink by then.
Last time I did RAGBRAI (1989?), several bicycles were stolen overnight in one of the stops. One of the group I was riding with lost her mountain bike.
So is crime a thing on RAGBRAI these days?
BTW, she managed to borrow a bike from one of the shops and she did get her bicycle back something like six months later.