East Troy High School, 3128 Graydon Ave., will host its annual Halloween Bash from 4:30 to 6:30 p.m. on Thursday, Oct. 27. Children 10 and younger, along with their parents, are invited to trick-or-treat through the school. The event will also feature face painting, a costume contest, pumpkin bowling and more. The Science Club will also be sponsoring a dinner during this event. For more information, call (262) 642-6760.