My quilt group is rather small too...around 18-20. We don't all meet at the same time, but we have several get together's every month. We started as a group brought together at a local quilt shop. When the owner passed away we all agreed to stick together. We meet every Tuesday night (with few exceptions) at one of the members houses for sit and stitch, although we do more sitting and talking than stitching. We get together every first Saturday at another member's house and on the third Saturday of every month at another member's house. We each volunteer to open our homes and sew and potluck. Just this last month another member started a block of the month which 8 of us have decided to join.
Then I am in charge of arranging two quilt retreats a year where 15-18 of us go. We have gone to the coast twice and just reserved the retreat house for a 5 day, 4 night retreat in October.