July 23 — Opening day, active rosters reduced to 30 players.
Aug. 1 — Deadline for drafted players to sign, except for players who have exhausted college eligibility.
Aug. 6 — Active rosters reduced to 28 players.
Aug. 13 — St. Louis vs. Chicago White Sox at Dyersville, Iowa
Aug. 20 — Active rosters reduced to 26 players.
Aug. 31 — Last day during the season to trade a player.
Sept. 15 — Last day to be contracted to an organization and be eligible for postseason roster.
Sept. 29-30 — Wild-card games.
Oct. 15 — International amateur signing period closes, 5 p.m. EDT
Oct. 20 — World Series starts.
October TBA — Trading resumes, day after World Series.
November TBA — Deadline for teams to make qualifying offers to their eligible former players who became free agents, fifth day after World Series.
November TBA — Deadline for free agents to accept qualifying offers, 15th day after World Series.
Dec. 2 — Last day for teams to offer 2021 contracts to unsigned players on their 40-man rosters.
Dec. 6 — Hall of Fame Golden Days Era committee vote announced, Dallas.
Dec. 7-10 — Winter meetings, Dallas.
Jan. 15 — International amateur signing period opens.
Feb. 1-19 — Salary arbitration hearings, Scottsdale, Ariz.
Feb. 17 — Voluntary reporting date for pitchers, catchers and injured players.
Feb. 22 — Voluntary reporting date for other players.
Feb. 27 — Mandatory reporting date.
March 15 — Last day to place a player on waivers for 30 days termination pay.
March 27 — Last day to offer a retention bonus to an eligible player attending spring training with a minor league contract.
March 30 — Last day to place a player on waivers for 45 days termination pay.
April 1 — Opening day, active rosters reduced to 26 players.
July 13 — All-Star Game, Atlanta.
July 25 — Hall of Fame induction, Cooperstown, N.Y.
Dec. 1 — Collective bargaining agreement expires, 11:59 p.m. EST.
Dec. 15 — International amateur signing period closes.
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