On March 14, 2026, the Boston Independent Supporters’ Association (ISA) marked the beginning of a new chapter for professional women's soccer in Boston. Members of the group participated in the opening match for the Boston Legacy at Gillette Stadium, signaling the culmination of over two years of grassroots organizing. Even before the franchise had finalized its name, mascot, or roster, the ISA had begun building a structured fan presence.

During the inaugural game, the supporters' section behind the north goal became the focal point for the ISA's activities. The group marched into the stadium accompanied by a Boston Public Schools marching band, displaying scarves bearing the phrase “Up the Swans.” The event also featured the unveiling of a tifo, a large visual display used by supporters to show team loyalty. The atmosphere was characterized by a high level of preparation, as the group sought to establish a distinct identity and culture for the team from its very first appearance. The ISA’s efforts represent a growing trend in professional sports where fan-led organizations mobilize well in advance of a team's official launch to ensure a dedicated community is in place for the first kickoff.