New York City Mayor-elect Zohran Mamdani will be sworn in by Attorney General Letitia James at midnight on January 1, followed by a public inauguration later that day with Senator Bernie Sanders administering the oath. Mamdani expressed gratitude for the involvement of both leaders, highlighting their longstanding commitment to justice and working class values. Sanders praised Mamdani's victory as a sign of progressive leadership and the strength of a movement prioritizing ordinary citizens over wealthy interests. The upcoming inauguration is expected to be larger than those of previous mayors, marking a significant moment for the city's political landscape.