A car is designed to run on a road. A cup is designed to hold coffee. An exhibition should be designed to allow people to access without queuing. That is all. The design task is not impossible.
Exhibits have to be designed for people use.
A clever-clever exhibit that people have to queue for is a failure. There could be flexibility with two channels. One channel is open when there are few people but there is a switch to the other channel if demand is heavy. Think about it.