Early October entertainment in Gateway Park means the summer isn’t over until it’s over. While it has been a little warm for bonfires, the cider, bales of straw, and music — and the bonfire — make for a relaxed way to spend an autumnal Thursday night in Rosslyn. The Bluegrass band, Moose Jaw, includes banjo by Jason Rose, guitar by Josh Taylor, and mandolin by Addison Bartlett — all three from Prince George’s County. One of their songs featured lyrics about Prince George’s County. From all five band members, most of whom started in grade school with classical music training, came skilled riffs, solos, and echoes of the blues.

Aside from foot tapping family time, the concerts support local charity. Proceeds from the drink purchases go to support A-SPAN, an organization striving to end homelessness in Arlington. Next Thursday’s concert, on Oct. 12, and the final bonfire concert, features Justin Trawick and the Common Good from 6-8 p.m. See www.rosslynva.org for more information.