雷军，致歉

Group 1 - The core point of the article is that Lei Jun, the founder and CEO of Xiaomi, announced the postponement of a New Year's Eve live stream due to a severe cold, rescheduling it to January 3 at 7 PM [1] - Lei Jun had initially planned to conduct a live stream on December 31, where he intended to engage with viewers by disassembling a car model, responding to suggestions from online users [2] - On December 25, Xiaomi held a product launch event for the Xiaomi 17 Ultra, which was hosted by other executives as Lei Jun did not take the stage [4]