why not have everyone go through their sewing rooms and donate the things they are not using then have a "Country Store" with garage sale prices. We did this and made over $1,000. Not all items need to be sewing related just in good condition. You could call it Treasure Island, Country Store, etc. The key is no dirty or junky items and low prices. Gently used is good but worn out is not.
Quiltmarm