Scottsdale is joining other Valley cities for the annual Unity Walk to promote mutual respect and understanding. The one-mile walk over the Mill Avenue Bridge begins at 6 p.m. Saturday, Jan. 28, and ends at Tempe Beach Park. There will be entertainment and cookies and hot chocolate. Bring your family, friends and pets. The Scottsdale assembly is meeting at 5:30 p.m. at the Tempe Town Lake Marina on the north side of the lake.