some great advice given--besides taking some rest breaks, I'd suggest you take advantage of the bag check services--you can have them hold onto your purchases which will keep you have having to haul them around. Definitely do not take a big/heavy purse--just the essentials in a cross body wallet. Many shows won't let you bring in food because the convention centers they use require food vendors be through them--but do take a bottle of water. or if they won't allow that, then be sure to purchase a bottle and hang on to it and re-fill.