The 1st Annual Beantownshows Holiday Benefit Jam has just added a one-time only ensemble to its line-up. The show will take place December 17 at Harpers Ferry in Allston, MA. The Boston All-stars will be comprised of the ubiquitous Sam Kinninger (alto saxophone), Addison Groove Projects Rob Marscher (keyboards), Andrew Keith (drums) and Ben Groppe (tenor saxophone) and Percy Hills John Leccese (bass). The bill also includes Goodfoot with members of the Boston Horns as well as opening act Stretch. All proceeds from the night will be donated to the Boston Rescue Mission, which operates one of the regions oldest homeless shelters, Kingston House.