February 3 - Cherokee Fiser admits taking $100 to throw a game from the 1876 season. Fiser will only appear in 1 more game in his career (1878) after his admission.
February 27 - Candy Cummings, player-manager of the Live Oaks of Lynn, MA, is elected President of the International League.
March 5 - The Hartford Dark Blues agrees to play its home games in Brooklyn. The team will retain the Hartford name, although it will only play 2 league games in Hartford.
March 22 - The National League publishes the 1877 schedule. It is the first time the league has handled scheduling and continues to this day.
April-June
April 12 - Jim Tyng, a catcher for Harvard, becomes the first backstop to wear a face mask during a game. Harvard team manager, Fred Thayer, will receive a patent for the mask in 1878.
May 2 - The Boston Red Caps, who will win the pennant with a 42-18 record in 1877, lose an exhibition game to the Allegheny club of the International League. Pud Galvin tosses a one-hit shutout and hits a home run to defeat the Red Caps 1-0.
May 17 - The National League votes to change to a livelier ball to replace the one described as being "dead enough to bury" in a special league meeting.
June 21 - Cincinnati stockholders re-structure the club in order to keep it running and maintain its place in the National League but 2 players, Jimmy Hallinan and Charley Jones, have already been signed by Chicago. The White Stockings will return Jones on June 29, but will retain Hallinan.
June 30 - Cincinnati signs Candy Cummings to help bolster their pitching. Cummings will continue to hold his position as President of the International League while playing for the Reds.
July-September
July 3 - Cincinnati loses to the Louisville Grays in their first game since re-organization. The Reds hope to avoid forfeiture of games played and expulsion by the National League by finishing out the season.
July 11 - Pete Hotaling, of the Syracuse Stars in the International League, wears a catcher's mask in his first game back after missing a month after being struck in the eye by a foul ball.
July 20 - Will White makes his major league debut. White is the first professional player to wear glasses. No other big-leaguer will wear glasses until Lee Meadows in 1915.
August 6 - As per National League rules, Cal McVey of the visiting Chicago White Stockings randomly draws the umpire from 3 slips of paper placed in a hat for their game against the first-place Louisville Grays. When McVey draws an umpire named Dan Devinney, he disgustedly grabs the hat and discovers that all 3 pieces of paper have the same name on them. The angered White Stockings proceed to pound the Gray's 7-2.
August 12 - Johnny Quigley, a catcher for the Harlem Clippers, dies from injuries sustained in a collision with Dan Brouthers at home plate on July 7th.
August 20 - Louisville Grays vice-president, Charles Chase, receives a telegram from an unknown source stating that something was going on with the Louisville players and that bettors were placing their money on Hartford in their game to be played that day. Hartford defeats Louisville 6-1.
August 25 - The Louisville Grays surrender a run in the 8th and 2 more in the 9th and lose to the second-place Boston Red Caps 3-2 in the opener of a crucial 3 game series. The loss drops the Grays into a first-place tie with the Red Caps.
August 27 - Boston takes the second game of their series with Louisville by a score of 6-0. The victory gives them sole possession of first place over Louisville.
September 25 - Jim Devlin and George Hall of the Louisville Grays are named by Louisville newspaper writer John Haldeman to have thrown an exhibition game played the previous day against Indianapolis. Both players will later admit this to club officials.
October 20 - Tommy Bond demonstrates proof that a curveball really does curve by throwing it around stakes driven into the ground before an exhibition game.
October 27 - The Louisville Grays formally drop Jim Devlin, George Hall, Al Nichols and Bill Craver for their involvement in the fixing of games. The players' remaining salaries are forfeited to the team. Devlin's testimony included statements that the Gray's had paid umpire Dan Devinney (see August 6) extra to call games in Louisville's favor in roughly 20 games during the season. The club denied the charge as a lie by Devlin, but the method for choosing umpires was changed by the National League before the 1878 season began.
November 24 - The New York Mercury prints an amazingly accurate prediction about the future of baseball. "The baseball mania is getting so bad that every city will soon have a mammoth structure like the Roman Coliseum to play in. This will be illuminated by electric lights so that games can be played nights‚ thus overcoming a serious objection at present existing."
December 4 - At its winter meetings, the National League formally confirms the expulsion of the 4 Louisville players. They also vote to throw out all of Cincinnati's games because they failed to pay their $100 league fee.
December 6 - William Hulbert is re-elected as president of the National League and limits are placed upon the amount of non-league games that teams may play. The league also strips the Hartford Dark Blues of their membership due to continual financial problems.
