I was of the impression that this conference has those as well, but I may be wrong. At the end of the day they need a way to determine who paid for what, and some sort of biometrics is going to be required for that. It could be a non-removable band or a photo. At least with the photo I can walk up to somebody and address them by name. In a former workplace of 400 people I found that quite valuable because there were a lot of people there who’s jobs I understood but who’s names I didn’t know.
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