I have not ridden in a group ride, but this come to mind:

Care for followers does not necessarily mean that you should accept undue responsibility for them. Leaders should, I think, decide to ride through any rain, accept all who wish to follow, and gracefully let others turn back if they wish. In other words, don't disappoint hardy riders who want a strong leader yet invite gentler riders to return another day.

I rode through two terrible downpours on my first attempt at a century. Tornadoes were in the area, but I didn't know it. I was wet, cold, getting dark, and I was having a ruggedly stubborn good time. It's a wonderful memory I'll keep close at heart when I get old and can't ride anymore.

Velo Rule V ...