I reckon plenty of hand sanitiser should cover the handling of instruments.
The SE & Midlands bashes I've been to have had plenty of space for folks, so distancing shouldn't be an insurmountable issue.
Masks if you need them - just like in shops & suchlike.
The bottom line is you'll probably be more at risk going to a supermarket. (IMHO)
Plus a healthy dose of common sense on the part of all attendees.