Friday Evenings: Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts. September 4 – Spirit of Slack Key; September 11 – From Mountain to Sea; September 18 – Dreams Come True; September 25 – Tour of the Islands.  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 art form.  Voted 2014 Best Live…