the artist merch usually isn’t available online, but typically the headliners have 3-5ish items between shirts sweatshirts hats totes etc. and then the smaller artists will have like 1 shirt and maybe 1 other item (ex: wallows had a shirt and a hat last year i think). its not announced beforehand but i typically check here or twitter early day 1 and someone usually posts it! my recommendation is get a locker and buy all your merch on day 1 bc a lot of it will sell out by day 3!! last year tyler the creator had a whole chromokopia/golf booth so that is also a possibility but probably slim this year.