Friday Evenings: Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. April 4 – Dreams Come True; April 11 – Tour of the Islands; April 18 – Hanalei Slack Key Guitar & Ukulele; April 25 – Legends of Slack Key Guitar & Ukulele.  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…