Global Union, noon to 6 p.m. Sept. 21. Alverno's free, outdoor world-music festival pairs the Muslim devotional music of Qawal Najmuddin Saifuddin & Brothers with the Christian gospel of Milwaukee's Masonic Wonders. Niger's Tal National and the Montreal-based hip-hop collective Nomadic Massive also will perform. Humboldt Park, 3000 S. Howell Ave. Visit alvernopresents.alverno.edu.