there were about 20 people there. About 10 of us are deeply into bitcoin. The rest were somewhat familiar and have even come to a couple of our other bitcoin events, but it's not their primary interest. It was basically "friends and friends of friends."

Everybody needed an LN wallet that supports lnurl withdraw. Two of the people had Aqua which apparently doesn't support lnurl, so their wallets failed on the first try. But within an hour, they had redeemed their qr codes. I didn't ask how they did it, but if I had to guess, I would guess they asked someone else what wallet they used, and it was probably wallet of satoshi, so maybe they downloaded that, then redeemed the qr codes, then sent the money to their Aqua wallet. Or maybe they just asked someone else to redeem theirs and then send them the money. I'm not sure.

I don't know of anyone else who had any issues. Happily, all 51 qr codes were redeemed within an hour.