If it's a Guild sponsored retreat there are often activities that involve everyone, in addition to doing what you want
I do an annual week long retreat in my son's upstate NY country home with 4 friends who live in various parts of the US. We come ready to sew non-stop, drink alot of wine and champagne, laugh, and eat way too much - each of us does at least one dinner; lunch we usually eat left-overs from one of the dinners and breakfast - you're on your own.
Regardless if it's Guild or private, most of us have pre-cut what we'll work on.