I have been to 11 live shows from 9/2020 till this week. Hospital grade N95 masks on till I was vaccinated, then off, till middle of July, when it was clear Delta was circulating in my area. The Beacon did a great job not only checking proof of vaccination, for this week's King Crimson concert, but also everyone's IDs to make sure they match the card. So, the risk of having many virus infected people inside the theater was low (there were probably a few though). Combined with a good N95 mask (95% effective) (cloth masks are theater (10-50% eff), surgical masks are made to protect the patient, not the surgeon (70% eff)), I was quite safe.
As an MD-PhD scientist with over 40 years of research and clinical experience, with particular experience working on mRNA, I will make a plug for the mRNA vaccines. They are incredible products. Game changers for medicine going forward. They are also super simple at the molecular level. They have less than a dozen components. It's just a piece of mRNA and a mixture of fats that encapsulate it, enabling the mRNA to get inside the cells. As a general rule in medicine, simple has less side effects.
Be safe everyone!
-docknow