One sister in my congregation happened to go to two different assemblies one year. She told me that she had believed that the person on stage relating the experience was the real person who actually had the experience. However, at another assembly, there was an entirely different person relating the same experience.
Apparently, all assemblies have to have the same experiences on the program, the person who actually had the experience (if it happened at all) can't go to all of the assemblies.