I'm sure they'll run it like they always do with the first of the 3 5-min. heats starting at around 11:30-11:45am. things usually finish around 4:45-5pm.

I've seen kids at other races but for their safety, please don't let them marshall and keep them out of pit lane. You might want to bring something for them to do, video games, a frisbee whatever. They'll get bored of the racing after about an hour or so.