Friday Evenings: Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. May 3 – Legends of Slack Key; May 10 – Sea Turtle Serenade; May 17 – Hawai`i’s Sunset Music; May 24 – Spirit of Slack Key; May 31 – Hawai`i’s Cowboy Music.  Free gift drawing.  Tickets: $20 ($15 keiki/seniors).  A portion of the proceeds supports the Hale Halawai Ohana `O Hanalei.  Hanalei Family Community Center, 5-5299 Kuhio Hwy, Hanalei.  4 to 6 p.m.  For information and…