Friday & Saturday, May 12 & 13: Kona Orchid Society Orchid Show, Plant & Craft Sale. Featuring orchid vendors from all over the island with exotic orchid species and exciting new hybrids. Orchid Growing Classes begin on the hour, from 11 a.m.to 3 p.m. Many handmade craft Items and fine art, and many types of plants available for sale. Old Airport Beach Park's event pavilion, 75-5560 Kuakini Hwy., Kailua-Kona. 9 a.m. to 4 p.m.  Free admission. For more information call…