The Indiana University Jacobs school of music is performing "Sacabuche" (right now) at St. Paul's Cathedral near the Boston common. The acoustics are surprisingly good here so the performance really only needs a couple of 10" speakers to help "pop" the voices.
And that works out well as we only had an hour to set up a PA system a 5000 lumen projector and a 10 foot wide screen.
Fortunately with a good crew and some forethought you can accomplish almost anything.
We managed to be ready 20 minutes early...