If you were a concert owner and wanted that badly, you would have the option to do it as a booking photos for your local venue, and if you really wanted, you could exchange sheets of photos to add to your book with other venues, and then you could ask your human bouncers to try to memorize these photos and look for those people and then look through the photo books as people were coming in.
Then if a match was found it could be double checked before messing up anyoneâ(TM)s night. But of course it would be slow as hell. And probably a lot less accurate, biased based on human prejudice, differently useful depending on who is checking, etc. But overall, thatâ(TM)s probably better than something that is incredibly efficient but still likely to make silent mistakes you will never know about, and also a huge liability problem on top of a massive technology cost, not to mention the moral and customer experience implications.
If you want to keep people out based on a list, keep a list of names and ID numbers, and check IDs, they even have a barcode on the back to scan. Require IDs at the door. No facial recognition required, and you can say itâ(TM)s to match tickets to the person and make sure they are old enough to drink.