Every year across the nation, several Pi Beta Phi sorority chapters host all-you-can-eat “Pi Phiesta” taco bar fundraisers at their respective campuses to raise money for charity. But that longstanding tradition, typically held around Cinco de Mayo, is in jeopardy. In the past few weeks, pressure from a handful of Latino students at two high-profile universities who complained the events are offensive prompted dramatic changes to two “Pi Phiesta” fundraisers. At Dartmouth College, the fundraiser was cancelled outright, and at Stanford University, the sorority girls scrapped their Mexican themed “Pi Phiesta” for a summery, ocean-themed one, although they still served...