OP, whatever you do don't be late
I'd suggest you arrive an hour or two early to make sure no traffic or parking problems
You need to be at the top of your game so make sure you have some snacks to hand so you don't get hungry
I would suggest a flask of tea & sandwiches wrapped in tinfoil
& some chocolate for energy
A kit kat maybe, tho only two fingers as you don't want to have a sugar rush
You could get two fingers in on the session, four if you are lucky
Best of luck
& make sure you report back on here soon as you get home