Saturday Evenings:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. April 2 – For the Birds; April 9 – Honoring Keli`i Mawae of Molokai; April 16 – Heart of Slack Key; April 23 – Kaua`i’s Slack Key; April 30 – Dreams Come True.  Free gift drawing.  Tickets: $20 ($15 keiki/seniors).  Slack key guitar and `ukulele in the real old style.  All traditional music with songs and stories of the islands, telling the history of this Hawaiian musical…