User Rich_D on here is well worth PM'ing about this also, but he's in Long Beach for Indycar (lucky so and so!) at the moment, so there may be a delay in him responding.
I would say that you'll be flagging rather than incident'ing, so unless you're comfortable AND experienced flagging, it's worth getting to that stage first.
If you do go, go with an open mind, fit in with some 'different' ways of working.
Get yourself some white jeans/painters trousers and long sleeve white polo tops to fit in - orange overalls not required