Among many funny things about Steve Roslonek, this may be the funniest: After everything that’s happened in the past 10 years, he still thinks his voice — and even his personality — is best suited to singing backup. Think about that when, in all likelihood, he and his band fill the Tabernacle in Oak Bluffs with thousands of parents and children for a free concert on Sunday afternoon and get them clapping, stomping and singing along to tunes such as Elephant Hide and Seek, The Veggie Song and Opposite Day.

Rachel Stein’s dad, Arthur (Adam Heller), after 9/11, had a freak out beyond everyone else’s freak out, but he had a certifiable right to it: One of the infamous planes flew into his office at the Twin Towers. While Arthur somehow muddled into a stairwell and was shepherded out by a fellow with a flashlight, the 65 employees who worked under him were not so lucky. Since then — and the action of the play takes place in 2003 — Arthur has not changed out of his pajamas and he’s starting to, well, stink.

Tonight, Rose Abrahamson will celebrate what she warns could be her last art opening. “I’ll be 87 in October,” she said by way of an invitation to come and preview her new paintings and collage work. “How much longer can I work?”