I bet the convention center or hotel has wheelchairs to loan (or rent for $5 per day or so) if you're going with a friend who can help you out if you need it. Otherwise....my dad had a really great lightweight walker that worked like a regular walker but then it had a seat in the middle where he could sit and rest when he needed it. Bet you could rent one of those at home and take it with you for when you need it.... OR---perhaps try calling a church near the show and explain what you need. Maybe they or a member would have what you need and would be delighted to loan it to an out-of-town guest.