I met this person on a tour and we barely spoke as it was in a crowd of people how do I reconnect with that person?

I didn't speak to this person one on one, have no way of contacting them, what should I do?

Plus if I go back there it will look like I'm stalking him.

I met this person on a tour and we barely spoke as it was in a crowd of people how do I reconnect with that person?
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