[dingaling]

If you're doing RFID cards I'd appeal to you to make them in the form of pin-badges that the guests can wear after 'check-in'.

I've been to many weddings over the past couple of decades and the one that was most successful in terms of breaking the ice between strangers had simple badges with ${NAME} and ${RELATIONSHIP TO COUPLE} on them. People felt very comfortable striking-up a conversation when they knew these two pieces of data, and there was less 'must remember the name' anxiety.