Sunday Afternoons: Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts.  February 2 – Slack Key Tour of the Islands; February 9 – Hanalei Slack Key; February 16 – Legends of Slack Key; February 23 – 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…