Wednesday Evenings:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts.  May 1 – Gift of the Ancestors; May 8 – For the Birds; May 15 – `Ohana Slack Key; May 22 – Spirit of Slack Key; May 29 – Legends of Slack Key. Award winning traditional Hawaiian slack key guitar and ukulele concerts featuring songs and stories telling its history.  Tickets $25 general admission, $20 Ages 13-19 & over 50, keiki under 5 free.   A portion…