There is no massive bidding war in the offing because most shows (a) need the time, (b) have schedules/reschedules to line up that would be chaotic, and (c) don't want to try to find an audience in the dead of summer, just as they didn't before the pandemic. In other words, relax.
How it is happening is the easy part. You can have a show with full audiences (if you can sell or give away that many tickets, that is) with 100% vaccination. Some shows may be taking a wait and see attitude to that, but there is not much reason for this one to, as I suspect pretty close to 100% of the audience for it is vaccinated already. E.g., adults in 10036 are currently over 95% first shot vaccinated.