ACTON — The Discovery Museums will hold the next event in their “Especially for Me” series from 5:30 to 8:30 p.m. Saturday, July 28, for families with children on the autism spectrum. The event is sponsored in part by the Dracut Cultural Council. Families can explore both the Children’s Discovery Museum and the Science Discovery Museum for free with pre-registration. Pizza will be provided, courtesy of Not Your Average Joe’s. To register, go to