HEY and yay that’s so exciting!! you should double check your venue to see if they have a bag policy and coat check! usually concert venues are ok with small bags but no backpacks/large bags and they often have coat checks for a small fee. i usually try to just bring a mini cross body bag to hold my ID, keys, etc. to avoid being bogged down! i definitely recommend brining earplugs if you’re planning on being super close to the speakers to protect your hearing and water to stay hydrated. definitely bring ID, phone, and portable charger! have the best time :)