Sunday Afternoons: Slack Key Guitar Concerts. Traditional Hawaiian slack key guitar and `ukulele concerts. October 5 – Spirit of Slack Key & Ukulele Concert; October 12 – From Mountain to Sea; October 19 – Dreams Come True; October 26 – Tour of the Islands. 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…