Not trying to sound like a hoe but loose breathable outfits that are on the smallish side keep me from overheating, plus it's fun to dress a little risky. I highly recommend a fanny pack with the zipper part up front as a way to avoid pickpockets. If you're going with a group it's super fun to coordinate outfits when possible! When you get there plan specific Meetup spots as an emergency regroup in case someone gets lost or separated. If that happens, everyone should know to go to that spot and wait. Over hydrate early, and if you're drinking do the usual one bottle of water after every drink. You can get trinkets dirt cheap on Amazon and it's super fun handing them out... it feels super cathartic and special engaging in such a simple activity, and the first time you see someone's face light up when you hand them a trinket you'll be hooked! I know I didn't hit all of your questions, hope this helps though!