Tuesday Evenings:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. September 4 – Poina `Ole – Never to be Forgotten; September 11 – Gift of the Ancestors; September 18 – For the Birds; September 25 – `Ohana Slack Key. Free gift drawing.  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.  Proceeds support Princeville…