Saturday, September 15: Obon Dance & Festival.  The Obon tradition was brought to Hawai`i by Japanese immigrants and evolved into a social and cultural event, as well as a religious custom designed to honor ancestors through an evening of dance, music and merry-making.  Free.  Festivities and Dance schedules and locations are listed below (subject to change): Autumn Okinawan Dance Matsuri:  Festivities are from 5 to 9:30 p.m., food booths available. Hawai`i Okinawa Center, 94-587 Uke`e St., Waipahu.  For information call…