In order to help you, you need to provide us with more information.
What do you mean by "sports-related" consumer show? Is this a fair, a sort of market with equipment on sale/ What sport(s)? Who do you want to ask questions? People selling equipment, members of the public, buyers?
What is your motivation for filming this event? Why is it important? Is there anything special about the event or the equipment being sold/exhibited here? Is this the first time or is this a yearly event? Is there any special significance for the locals? Will any (sports) celebrity be attending?If so, you need to obatin info about this person(s).
Will someone be demonstrating a sport using some kind of equipment? How big is the arena/sports ground, etc? Why are the organizers putting on this event?
These are things I would try to find out if I had to film this event and in order to figure out what to film and what questions to ask.