What explains differentiation in a nonprofit’s organizational practices around partnering with businesses? I propose that attendance at events plays a role. To explore this, I identify a network of energy and environmental nonprofit organizations and the events that brought them together to influence appliance energy efficiency from 1994 to 2006. Using network analysis to identify cohesive subgroups, I find that over time, organizations become more likely to choose one type of event over another suggesting niche development occurred in the field. I also find that, controlling for previous efforts with businesses, funding, and mission, organizations that belonged to a cohesive subgroup of organizations brought together by an annual event promoting cooperative market approaches from 2001 to 2006 were five times more likely than those nonprofits in other subgroups to partner with business. This research has implications for understanding the creation of new events and its impact on organizational practices.