Members of Slighe nan Gaidheal, Washingtong’s Scottish Gaelic society, will be demonstrating the ancient tradition of waulking the tweed at Northwest Yarns & Mercantile. Cloth workers sit and sing as they work the wool by passing it between them and beating it rhythmically against the table, tightening and softening the fabric. You’ll have the chance to learn, observe, and participate! 2 p.m., Northwest Yarns & Mercantile, 206 W. Magnolia St., Bellingham, 360.738.0167, nwyarns.com