The Island-based youth improv troupes WIMP and the Imposters will perform at Alex’s Place at the YMCA of Martha’s Vineyard from 8 until 9:30 pm every Thursday through August 18. The groups deliver comic short-form and long-form improv based on audience suggestions. Tickets are $11 for teens and $15 for adults. Day-of-show discounts may be available by through Twitter @IMPandWIMP. For more information, call 508-939-0688 or firstname.lastname@example.org.