Martin Luther King Jr. Day — because it was a day off for many, because of the peaceful resistance King preached, or a combination of the two — saw activists and politicians battle chilly weather to fight for their causes. In Washington Square Park, a noon rally found protesters demanding the release of immigrant rights leaders Ravi Ragbir and Jean Montrevil. After a Jericho walk around Ai Weiwei’s “Arch,” hundreds gathered in nearby Judson Memorial Church alongside Ragbir’s wife, Amy Gottlieb. A 3 p.m. Rally Against Racism in Times Square also took on immigration, with attendees gathering to protest President Donald Trump’s “shithole” comment in reference to Haiti and African countries.