My boyfriend has a bad hip and walking is a problem. Does this venue provide scooters or anything similar for handicapped people?

Yes they do, near the big tent, there was a scooter rental booth with daily & hourly rates.

There where for the Barrett-Jackson auction

Scooters available at front gate of event. Somewhere around 80 bucks.

Depends on the event. 95% of the time they have scooter rentals.

There are scooters to rent and there is shuttle service available.

Yes scooter rentals are definitely available