Sunday Afternoons: Slack Key Guitar Concerts. Traditional Hawaiian slack key guitar and `ukulele concerts. December 7 – Legends of Slack Key Guitar & Ukulele Concert; December 14 – Kaua`i Slack Key Guitar & Ukelele Concert; December 21 – Hawai`i’s Cowboy Music; December 28 – Circle of Life. 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…