I think this is a good idea. I agree with you about the QR code being problematic, simply because some bars are extremely crowded, and it would be difficult to

I think this is a good idea. I agree with you about the QR code being problematic, simply because some bars are extremely crowded, and it would be difficult to ‘find’ the QR code. Also, anybody could take a picture of the QR code and re-share it.