Saturday, August 20:  Sunset Serenade Concert Series - Raiatea Helm. A standout in Hawaiian music, Raiatea Helm is renowned throughout the world for her collection of melodies. For more than a decade, Raiatea has set the Hawai`i music community on fire with her pure voice and vocals of the Hawaiian language.  Hawai`i Kai Towne Center, 333 Keahole St., Honolulu.  Free.