A safe and fun place for ghouls and boys on Halloween! The 10th annual MHSC Trick-or-Treat Extravaganza; October 31 from 5-7pm (MHSC lower level) Memorial Hospital will celebrate their 10th annual Trick-or-Treat Extravaganza on Halloween night (Friday, October 31), 5-7pm. Are you looking for Advertising October 31, 2014