High Quality Content by WIKIPEDIA articles! Von Steuben Day is a holiday traditionally held on a weekend in mid-September (von Steuben was born September 17), celebrating Baron Friedrich von Steuben, who arrived in the United States as a volunteer offering his services to General George Washington, and is generally considered the German-American event of the year. Participants march, dance, and play music. While Steuben Day is celebrated in many cities all across the United States, the largest crowds gather in New York City.