Imperial Hotel Tokyo’s official history records Queen Elizabeth II and Prince Philip attending a Japan-British Society welcome luncheon in the Fuji Room, and the hotel’s anniversary chronology dates the event to May 9, 1975. This verifies an event at the property, not an overnight stay.
Queen Elizabeth II attended an official welcome luncheon at Imperial Hotel Tokyo with Prince Philip on May 9, 1975. The hotel’s own historical records place the royal couple in its Fuji Room and identify the Japan-British Society as the luncheon’s organizer.
Source conclusion:
The cited sources confirm attendance at an event at the hotel, but not an overnight stay.
