美国总统特朗普：将于美东时间周五16:00（北京时间周六04:00）在白宫举行（大漂亮税收法案的）签字庆祝活动。

Group 1 - The article highlights that President Trump will hold a signing celebration for the "Big Beautiful Tax Reform" at the White House on Friday at 4:00 PM Eastern Time, which corresponds to 4:00 AM Beijing Time on Saturday [1]