The community service group in my guild offers a variety of opportunities for people to participate.
There is a meeting on a regular basis where some of the "regulars" go and sew.
They offer complete components (top, backing, batting, and binding - all precut) so a member can take it home and sandwich/finish the quilt.
They offer prepacked kits (sometimes for blocks and sometimes for quilts) that someone can then assemble.
Depending on how much time I have, I will take what works. On real busy months, I may just take a few blocks home to finish. That way I contribute in a manageable way.