Sunday Afternoons:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts.  May 1 – Circle of Life; May 8 – Hanalei Slack Key; May 15 – For the Birds; May 22 – Honoring Keli`i Mawae of Malokai; May 29 – Heart of Slack Key.  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…