The boom in on-line performances provides a basis for a recovery to start with gatherings in private homes - then sessions and house concerts in small venues, whichever ones are still open. The larger the scale, the longer the recovery will take, more because of financial risk than infection risk - and given the additional hit of Brexit, folk stadium concerts are probably gone forever.

Folk clubs are in the middle of this spectrum. It might take more energy and commitment to restart one than can be found. I can't see many of them making it.