How did Post 28 in Maryland take part in a special Armistice Day ceremony?

According to the timeline on Kennedy-Latimer Post 28's page on the Centennial Celebration website, in February 1933 it is "designated as the 'Flag Post' of the state by the Department of Maryland. Several embassies of our World War I Allies present their nation's flag to the post." That November, "Post 28 participates in the Armistice Day ceremonies at Arlington Cemetery with amassing of Allied flags. A member of the post, bearing that country's flag, accompanies a representative of each Allied nation of World War I as they advance and place a wreath at the Tomb of the Unknown Soldier."