Sunday Afternoons:  Slack Key Guitar Concerts.  Traditional Hawaiian slack key guitar and `ukulele concerts.  October 4 – Po`ina Ole – Never to be Forgotten; October 11 – For the Birds; October 18 – Whales Homecoming; October 25 –`Ohana 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 the history of this Hawaiian musical art form. …