The 1882 Major League baseball season was contested from May 1 through October 2, 1882.
The AA was established with the expectation that it would have more of a "liberal policy" and better labor relations, threatening the puritanical NL, which itself had formal behavior codes with associated policies and procedures and a blacklist for players who did not comply to said rules.
Three of the six teams of the American Association survive to this day as National League teams; the Cincinnati Red Stockings, Pittsburgh Alleghenys, and St. Louis Brown Stockings are today's Cincinnati Reds, Pittsburgh Pirates, and St. Louis Cardinals.
National League Opening Day took place on May 1 featuring all eight teams, while American Association Opening Day took place on May 2, featuring all six teams.
The National League would see its final day of the regular season on October 2 featuring a game between the Boston Red Caps and Providence Grays, while the American Association would see its final day of the regular season on October 1, featuring a game between the Louisville Eclipse and St. Louis Brown Stockings.