This paper examines how participatory music making (Turino, 2008) generates spaces of possibility within community music practice. The author conducted interviews with 19 ukulele club members, including the group leader, about their participation in and commitment to the group, analyzing the transcripts alongside the author's own long-term participation and observation. This presentation develops the idea of "room" as it relates to community music - moving beyond the confines of physical space to describe social and constructed dimensions that make participation possible: openness, permeability, and limits, shaping how people enter, remain, and grow within this musical community. Findings highlight key tensions that characterize and shape this group's ongoing practice: 1. between hospitality and threat, being open to the incoming of another while recognizing the potential risks; 2. between the group’s purpose, understood through actions rather than articulated, and moving beyond that purpose; and 3. between the actual and the possible, the here and now against the future, of the members and of the club. These tensions reveal how participatory music making continually generates and negotiates boundaries of inclusion, purpose, and growth. While grounded in a specific case, this research offers insights into how musical communities sustain participation while holding space for uncertainty, transformation and renewal.