I almost agree with Jack C although, in the great scheme of things, most folk clubs are probably more at the smaller end of the spectrum.
So, they may have a better chance. Certainly the more cosy and community variety. Even Edinburgh Folk Club could fall into such a category since they moved to a smaller venue a few months ago.

Then medium sized venues but I reckon many people will be very cautious about attending larger events until they are very sure that the virus has been eradicated.