Sunday, October 18:  Hawaiian Slack Key Guitar Festival “Westside Style”.  Event features up to 15 artists in the Hawaiian slack key guitar genre for a six hour long concert. Event also features island crafters, food vendors, a guitar and ukulele exhibit, free giveaways throughout the entire event and at the end of the day a brand new Taylor Guitar will be given away to some lucky festival attendee. Hoalauna Park, 91-1330 Keaunui Dr., Ewa Beach. Noon to 5 p.m. Free…