I don’t have a group per se. I have invited a few friends — if SHTF. All of these invited friends have skills, mostly former military friends plus some friends with medical skills. Depending upon the calamity, I doubt that all, maybe only a couple, will make it here. I have laid down extra supplies just in case. As for skills, we all have a lot of overlapping skills.
I live in a rural town. Most of the neighbors here are very self-sufficient and tight with other locals (myself included). The neighbors have lots of crazy skills and have taught me quite a bit (wood stove cooking, canning, local plants, edible plants).
The issue would be the summer people (depending upon when the calamity arose). I am probably far enough off the beaten path (rural dirt lane) to not even affected by the summer folks. I do need to come up with a plan on how to deal with these potential unwanted guests.