Where will your muggle be on Saturday, Jan. 9? If he loves Harry Potter, he’ll want to be at the Brentwood Public Library (8109 Concord Road) when a new chapter of the Harry Potter Alliance kicks off. The alliance, a non-profit aiming to see Potter fans work in activism to benefit the world, is involved in numerous libraries and groups across the nation with chapters of their own. The first meeting (free) is from 2 - 5 p.m. and is open to ages 6 and older. Interest piqued? Learn more about what the Harry Potter Alliance is at thehpalliance.org.