March 26 — Opening day, active rosters reduced to 26 players.
April 18-19 — San Diego vs. Arizona at Mexico City.
April 28-30 — New York Mets vs. Miami at San Juan, Puerto Rico.
June 3-4 — Owners meeting, New York.
June 10-12 — Amateur draft, Omaha, Neb.
June 15 — International amateur signing period closes.
July 2 — International amateur signing period opens.
July 10 — Deadline for drafted players to sign, except for players who have exhausted college eligibility.
July 14 — All-Star Game at Los Angeles.
July 26 — Hall of Fame induction, Cooperstown, N.Y.
July 31 — Last day during the season to trade a player.
Aug. 13 — New York Yankees vs. Chicago White Sox at Dyersville, Iowa.
Aug. 23 — Boston vs. Baltimore at Williamsport, Pa.
Aug. 31 — Last day to be contracted to an organization and be eligible for postseason roster.
Sept. 1 — Active rosters expand to 28 players.
Sept. 29-30 — Wild-card games.
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.
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