Regional theaters everywhere are planning to reimagine the live experience, social distancing and masks intact for the time being. Expect some of those to open first, albeit without national tours (I think those could come back gradually if all goes well with Broadway). I'm not so sure exactly where the first notable reopening will be, though.
Some might say that Spring 2021 could be too soon for a Broadway comeback at the moment. Right now, I don't see shows gearing up for re-rehearsals/re-teching in January-February, as Charlotte St. Martin would like to see. Ya never know though... the vaccine and treatment candidates so far look quite interesting to say the least.
“I am furious, but I am sailing.”