Fridays & Saturdays, throughout the month of August: Obon 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.  Friday & Saturday, August 1 & 2: Palolo Higashi Hongwanji, 1641 PaloloAve., Honolulu. 7 p.m. For information call (808) 732-1491. Friday & Saturday, August 1 & 2: Waipahu Soto Zen Mission Taiyoji, 94-413 Waipahu…