Sunday Afternoons:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts.  January 5 –Heart of Slack Key; January 12 – Spirit of Slack Key; January 19 – From Mountain to Sea; January 26 – Honoring Raymond Kane.  Tickets: $20 ($15 keiki/seniors).  The concerts are nahenahe - soft and sweet.  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. …