Yep one can create regular meetup.com events as ‘couchers meet travellers and locals’’ I guess. Then promote that to his/her facebook or/and instagram actually.
You need dedicated locals who love the idea and are not afraid of both strangers/travellers, but also of covid19.
We use masks and wash hands all the time, i dont see why an event OUTDOORS that is regular and uses masks/handwashing would not be feasible also in the app of couchers.org when its ready. JUst reminding ppl to wear a mask, do not attend an event if recently were sick, and if you want to go super strict, an event can admit only users who have recent covid19 test tested negative (this happens in some countries’ borders right now as a method of control).
But a mask that is comfy (not all mask allow you to speak and be heard, some have a shape so that you can speak!) and lots of alcohol gels around and distances between each person ,in an open space and not indoors, shold work ok i think. If someone is visibly sick they should not attend any event. COvid19 also spreads from non-sick carriers but thats why we wear the masks for and keep distance from and prefer open air meetings than indoor cafes.