Jack,

I agree that the "touring circuit" will take quite a while to recover but more local artists might find it easier to do bookings.

Smaller clubs like Nitten(in Scotland) and similar which tend to focus more on singaround/resident nights might fare better at the start. They also have guests but these usually tend to be smaller names with a few exceptions and only happen on a monthly basis.

If the venues are open for other purposes then it should be possible to hold such events with care.

Again, it's over pessimistic to assume that most of us over a certain age(Includes both of us) will die. Even among the older age group, a majority of people should recover.
Besides, I'd certainly feel much safer sitting in a folk club albeit a safe distance from everybody than visiting the supermarket.