Hansel and Gretel, by Englebert Humperdinck, an opera based on the fairy tale by the Brothers Grimm. The performance will be semi-staged, with chorus and orchestra conducted by Alan Yost. Lead singers are Robin Farnsley (Gretel), Kathryn Tolley (Hansel), James Liu (Father), Lindsay Burroughs (Mother), Margretta Beaty (Witch), Emily Adams (Sandman), and Laura Proctor (Dew Fairy). This is a special event to benefit 51 Walden. Tickets are $20 adults/$10 children. Call 978 369-7911 or buy on-line.