Face covering or mask

Lanyard with credentials and/or tickets for easy access

Sunscreen--remember to re-apply often!

Water--hydrate, hydrate, hydrate

Comfortable shoes

Ear protection

Rain jacket or poncho

Spotter guide--available for free at the track, for in-car radio frequencies, current liveries, and event highlights

Merchandise--available in the INDYCAR merchandise trailers/tents and online here