Karo,
I sympathise with you. I fractured my ankle and leg earlier in the year. I had the walking cast on but wanted to go to the show in March. I was luck enough to get a handicap parking spot at the time so I was able to go in for an hour. I do have a couple of suggestions to maybe help you. They are:
1. You may want to just get a room at the hotel for even 1 day so if you wanted to go up and rest if your legs started to bother you or if you wanted go to the show for more than 1 day. I understand some of the hotel do have schutte buses to the bead show, which would drop you off at the front door.
2. What I did back in March is I printed out the vendor list and the floor plan. I research each vendor to see who I wanted to look at again in person or purchase from. I found their location on the floor plan and highlited it with a yellow high-liter marker. Then I plan a route to the booth so I could do it in the shortest circle to cover all of the booths.
3. Do you have a friend or family member going with you that could maybe push you in a wheelchair for maybe part of the time to give you a chance go get the items you want.You can check, but I think they have wheelchairs there you can rent. If not, you can rent one from a durable medical equipment company. They have some named Ultra-lites that weigh only 19 pounds, which makes it easily lifted from a car trunk by most people. The rental is very inexpensive. The Ultra-lites are chairs without the large wheels only about 10" diameter wheels, therefore you would need someone to push you, but it makes it extra lite for lifting.
I hope some of these will help you. What ever you decide, have fun at the show. It is a show to look forward to every year. Good luck and I hope you enjoy the show. See you there.