Costumes are heartily encouraged at Willamette Humane Society’s annual Bowser’s Boo Bash Oct. 27 at the Salem Conference Center.  Fun on tap will include a live auction, gourmet dinner, live music, and complimentary beverages.  A silent auction is also in the mix, featuring more than 200 items on the block.  For details, including sponsorship opportunities, visit WillametteHumane.org.