I started a DIP to have a Keycard (https://keycard.tech) based smartcard handed out to Devcon attendees. Looking forward to your comments and discuss this !
It’s a good idea, I have been using keycard for awhile.
It can be a container for all “sponsored” tokens.
It has NFC, can play with IOTs
The POAP team is very keen on collaborating with this initiative. One idea that comes to mind (no clue about implementation strategies) is to have a special POAP for attendees that have tapped with their Keycard on each corner of the venue, to provide an incentive for people to explore the space and visit the less popular areas as well.