This is a great idea, and I'd love to do this at other networking events or even social events like weddings.

The biggest obstacle to doing this at social events is that people often want to take photos throughout the night, and own phones are almost always how we do this. One solution is to ensure there's a good roaming photographer who can take peoples details and share the photos later, but it still feels like a bit of a barrier to scaling this to places like function centres, etc.