The White House typically calls a full lid when the president's public schedule concludes for the day, signaling no further events, statements, or pool coverage will occur and allowing the press corps to depart. For the May 18-23 period, following President Trump's return from Beijing on May 15, the calendar shows mostly closed-press executive time, intelligence briefings, and standard in-town pool rotations with no announced evening travel, summits, or late policy announcements. Routine factors such as bilateral calls, internal meetings, or unexpected developments like legislative updates or international incidents can delay or lift a lid after 6:30 PM. Traders monitor daily pool reports and the absence of major milestones, such as those surrounding the upcoming Memorial Day observances, to assess the likelihood of an early close on each weekday.