It will be the morning it is much cooler than the PM plus it will be only an hour and a half for each session. It barely touches 85 by noon. No water truck runs since all that doesa is add 10 minutes to a short session.
Why not run AM and PM? Is that people leave at lunch which is a major problem for people who want to run in the PM since you have only half the workers and the chance oif rain goes up considerably in the PM . It is either do this or no events at all. I think this is slightly better.