I have told my daughters to have a rummage sale advertising quilting supplies after they and grand-kids pick out what they want. Then the rest can go to at least three churches I know of who will take anything.
The sewing machines could be sold at the rummage sale, but not too cheaply. I would hope they would want to keep a few rare ones, but what is left should to given to the "Sewing Machine Project" in Madison, WI. They distribute machines to needy people all over the world.