With new found success with their beef sandwich, they named it the "hamburger" after the Erie County Fair's home town of Hamburg, New York. "National Birth of the Burger Day" is celebrated on September 18 to honor the invention of the burger in 1885 at the Hamburg Fair. With new found success with their beef sandwich, they named it the "hamburger" after the Erie County Fair's home town of Hamburg, New York. "National Birth of the Burger Day" is celebrated on September 18 to honor the invention of the burger in 1885 at the Hamburg Fair. With new found success with their beef sandwich, they named it the "hamburger" after the Erie County Fair's home town of Hamburg, New York. "National Birth of the Burger Day" is celebrated on September 18 to honor the invention of the burger in 1885 at the Hamburg Fair. With new found success with their beef sandwich, they named it the "hamburger" after the Erie County Fair's home town of Hamburg, New York. "National Birth of the Burger Day" is celebrated on September 18 to honor the invention of the burger in 1885 at the Hamburg Fair. With new found success with their beef sandwich, they named it the "hamburger" after the Erie County Fair's home town of Hamburg, New York. "National Birth of the Burger Day" is celebrated on September 18 to honor the invention of the burger in 1885 at the Hamburg Fair.