Question: The 2015–16 Xavier Musketeers women's basketball team represented Xavier University during the 2015–16 NCAA Division I women's basketball season, they were third year members of the newly reorganized Big East Conference, a collegiate athletic conference that competes in NCAA Division I in all sports except football, and has been officially recognized as a Division I multi-sport conference, effective on which date?
Sentence (from "Big East Conference"): The Big East Conference (stylized as BIG EAST) is a collegiate athletic conference that competes in NCAA Division I in all sports except football, which is not sponsored.
Relevant evidence: No