I’m probably late but make sure to bring a portable charger and a charging cord, a jacket, a clear backpack (make sure to read the rules for the venue) maybe a clear plastic water bottle that’s empty so you can fill it with water once you get inside, make sure to eat beforehand because venues are pricey with everything, ear plugs and make headphones to go over them depending on how noise sensitive you are and then for the lights thing, I’m not too sure but maybe sunglasses(?) might help. Before the concerts starts, find where the restrooms are. Also be courteous to others, don’t use flash unless it’s an “everyone turn on their flash” sort of situation, don’t sing the lyrics extremely loud (when it’s not the appropriate situation such as the singer singing softly, etc) because it is very frowned upon and hey, maybe you’re singing will be the highlight of someone’s TikTok video and all the comments will be talk about how annoying the loud singing is. Anyways lmk if you have any other questions, I have been to like 20+ concerts!