Question: What was the first use of the East Sitting Hall at the official residence and workplace of the President of the United States?

Context paragraphs:
Presidential palace: A presidential palace is the official residence of the president in some countries.  However, some countries do not call the official residence of their head of state a "palace" or use the building only as a workplace separate from the president's actual home.  Some presidential palaces were once the official residences to monarchs in former monarchies that were preserved during those states' transition into republics.  The Cumhurbaşkanlığı Sarayı in the Turkey is the world's largest Presidential Palace, four times that of Versailles.

White House Chief Calligrapher: The White House Chief Calligrapher is responsible for the design and execution of all social and official documents at the White House, the official residence and principal workplace of the President of the United States.

White House Chief Floral Designer: The White House Chief Floral Designer is responsible for the planning, design, arrangement and placement of all floral decorations for the First Family, their private entertaining, and official state functions at the White House, the official residence and principal workplace of the President of the United States.  The current Chief Floral Designer is Hedieh Ghaffarian.

White House: The White House is the official residence and workplace of the President of the United States.  It is located at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every U.S. president since John Adams in 1800.  The term "White House" is often used as a metonym for the president and his advisers, as in "The White House announced that...".

Second Floor Center Hall (White House): The Center Hall is a broad central hallway on the second floor of the White House, home of the President of the United States.  It runs east to west connecting the East Sitting Hall with the West Sitting Hall.  It allows access to the elevator vestibule, East and West Bedrooms, the Grand Staircase, Yellow Oval Room, the first family's private living room, and the president's bedroom.

East Sitting Hall: The East Sitting Hall is located on the second floor of the White House, home of the President of the United States.  First used as a reception room for guests of the president (the Lincoln Bedroom and the Queens' Bedroom were originally offices of the chief executive), it is now a family parlor with access to the east rooms on the second floor.

White House Social Secretary: The White House Social Secretary is responsible for the planning, coordination and execution of official social events at the White House, the official residence and principal workplace of the President of the United States.

West Sitting Hall: The West Sitting Hall is located on the second floor of the White House, home of the President of the United States.  The room is entered from the second floor Center Hall on the east side of the room.  The room features a large lunette window on the west wall looks out upon the West Colonnade, the West Wing, and the Old Executive Office Building.  The room is used by first families as a less formal living room than the Yellow Oval Room.

Hammerschmidt Villa: Hammerschmidt Villa (German: "Villa Hammerschmidt" ) is a villa located in the German city of Bonn that served as the primary official seat and primary official residence of the President of the Federal Republic of Germany from 1950 until 1994.  President Richard von Weizsäcker made Bellevue Palace in Berlin his primary official seat and residence in 1994.  Since 1994, the Hammerschmidt Villa has served as a secondary official seat and secondary official residence for the President.  In German, the Villa is also called the "White House of Bonn", because of its vague resemblance to the official residence of the President of the United States.

White House Chief Usher: The White House Chief Usher is the head of household staff and operations at the White House, the official residence and principal workplace of the President of the United States of America.  Timothy Harleth was appointed the current Chief Usher by President Donald Trump on June 23, 2017.

Supporting paragraphs: East Sitting Hall White House
Answer: reception room