If you’re in a vaguely sensitive industry, there’s going to be a few people seeing what they can get into at those conferences.
This is especially true of things like cyber security conferences, or tech. They’ll be crawling with corporate spies.
Actually, I’d say any major trade or industry conference is going to have corporate spies and more… eh, freelance trying to see what they can get into.
So the question becomes: have you/your company run a background check on that guy? No? Then why the hell do you trust him?