From Time.

After a lifetime of activism, including work on the Japanese American redress movement and “friend of the court” briefs on behalf of Muslim detainees in U.S. military prisons, Korematsu died in 2005 at the age of 86. Since then, three schools in California have been named after him, and in September 2010, California passed the “Fred Korematsu Day of Civil Liberties and the Constitution” bill, the first day in U.S. history to be named after an Asian American. Starting this year, on January 30 of each year, schools are encouraged to teach Korematsu’s story and why it remains so relevant today

I’m trying to think of other holidays named after litigants in Supreme Court cases, and can’t think of any.