Japan's Emperor Naruhito will deliver his New Year message and participate in a public greeting event at the Imperial Palace, with Prince Hisahito attending for the first time. The Emperor previously emphasized peace and hope for the new year. In New York City, Mayor Zohran Mamdani begins his first full day in office, facing an ambitious agenda including rent freezes and universal childcare. Prime Minister Narendra Modi is scheduled for quarterly sectoral reviews of the Coal and Mines Ministries.