Sunday Afternoons: Slack Key Guitar Concerts. Traditional Hawaiian slack key guitar and `ukulele concerts. August 2 – Legends of Slack Key Guitar & Ukulele; August 9 – Honoring Raymond Kane; August 16 – Traditional Hawaiian Slack Key; August 23 –Hawai`i’s Sunset Music; August 30 – Poina Ole – Never to be Forgotten. 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…