In the vast majority of venues, ID checks are happening anyway to verify eligibility for drinking.

In practice a lot of venues are already 21+ so they are already checking IDs.

>Adding ID checks would make venue entry a slower and more tedious process.

Airports seem to handle them just fine?

Maybe a bit of a dystopian situation but ... I think this was 10 year ago now I went to an Utada Hikaru concert where I had to upload a picture of myself on a dedicated website and when the tickets were scanned I think they had access to that picture

Here’s a wild idea, tie tickets to a drivers license/photo id number, and scan the id.

Edit guess that doesn’t work for kids. Start the tickets at 10k and drop them by a percentage a day. Automatic price discovery. Rich people can just buy them whenever they want.