“Everyone’s saying there’s never any room at our shows,” Ry Cavanaugh told a less than half-full City Winery on Tuesday. “We solved that problem.”

So far any way. A buzz is likely to build over Session Americana’s Tuesday night residency this month at City Winery. And people loosely settled in the front half of the room on Tuesday were surely happy to be ahead of any curve, like those who first caught the group years ago at smaller places like Toad and the Lizard Lounge.

As usual, Session Americana revolves around a small, literal roundtable fitted with microphones, an informal forum where the musicians swap stage positions, lead vocals and various instruments, including mandolin, accordion and pump organ. And for this residency, multi-instrumentalists Cavanaugh (no relation, he piped on Tuesday), Dinty Child and Jon Bistline, harmonica player Jim Fitting and drummer Billy Beard (his stripped-down setup anchored by a suitcase kick drum) enjoy addition icing from electric guitar ace Duke Levine.

On Tuesday, the group swung from light-hearted to contemplative roots music, peaking with a spirited cover of the Band’s “The Shape I’m In” and a rousing Child-led ode to “Beer Town,” where the bandmates giddily chimed “I like people who bring me beer!” A funny inclusion for a winery, even if the venue also serves beer.

Best of all, this residency supplements the camaraderie with different guests every week. Tuesday’s show included the Suitcase Junket, aka junkyard troubadour Matt Lorenz (pictured above at center), who also kicks a suitcase as part of his makeshift solo getup. The rollout continues on Tuesday Oct. 9 with gospel trio the Revs (Andrea Gillis, Jenny Dee and Chris Cote) supplementing a complete rendition of Lucinda Williams’ self-titled 1988 album that became a touchstone for the Americana trend. Soul singers rule when Jesse Dee joins the gang on Oct. 16 and Ali McGuirk does the same on Oct. 23, before blues-folk duo Gentle Temper rounds out the guest lineup on Oct. 30.