Hello Shakti
Is it your first presentation? I’m sure you are excited 
To answer your question: Yes we talk to the client, tell them about the idea and the benefits, and sometimes an archviz video walkthrough of one of our projects. Then we pop the headset on and they go Woooow 
Mostly the clients want to know how we deliver the service and what support we provide, given that it’s a system stationed in the clients space. Sometimes they will ask about other visualizations such as exterior or landscape.
This specific expo was different in that it wasn’t a living space, but more of monumental in nature. And the client was the architect. We also provided all the graphic art and promotional print.
I hope this answers your questions.
Good luck with you presentation