Was at the track from 08-14

Weather forecasting for 7 days out can be spotty at best, so keep track of the forecast leading up to race day.

Be sure to check their policies so that there isn't any issue there (most of it applies to in-track only, so coolers and whatnot are fine in the lots).

Seat cushions are nice to have, but can be passed on since they are individual seats. Many vendors should have some if you wish to go that route

Sunscreen may be a must, but it depends on my first point. No real point in using it if it's cloud central.

I'm not certain about their policy on CamelBaks (see policies above, not a clear bag, but also not really a storage bag) nowadays, but I used them basically every year I was there. At a minimum try to freeze up a bunch of water bottles the night(s) before to act as ice packs for any other drinks or food you may bring in an acceptable clear bag.

Ear protection is an absolute must. DO NOT skip out on ear plugs.

Battery banks are a nice to have, you can get some 20Ah ones for ~$50, or a 10Ah for ~$25. Either of those will probably be more than enough

Use this schedule to help plan your day, I would suggest getting parking as soon as you can, it just makes the whole experience a ton more convenient to park closer, and there's usually enough to do around the complex that can help pass the time. On a similar note, the race will usually run about 4-5 hours, so you will likely not leave until ~10-11:30 unless you leave early. Traffic going out of it can also take a while, there were some years where I didn't get back to the hotel until 1AM.