Friday Afternoons: Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. May 4 – Ahupua`a – Mountain to Sea; May 11 – Hanalei Slack Key; May 18 – ‘Ohana Slack Key; May 25 – Hawai`i’s Cowboy Music.  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.  A portion of the proceeds support…