[1] At its beginning, the founding mothers of Sigma Phi Omega were invited by Chi Alpha Delta, an Asian-American sorority from UCLA, to become one of their chapters.

There are annual conventions held each summer as well as Mid-year Retreat, where sisters from different chapters gather to bring orders of business as well as bond.

These conventions and retreats are hosted by the chapters in rotations Service is one of the main pillars within the sisterhood of Sigma Phi Omega.

Throughout the month of October, all chaptersorganize a "SAFE (Stop Abuse For Everyone) WEEK" filled with seminars and discussions about domestic violence and fundraising events.

While raising domestic violence awareness is Sigmas' main philanthropy, the chapters also sponsors and participate in AIDS Walks, Habitat for Humanity, Canning for Hunger, Girls Inc., various shelters, clean cities programs, and more.