January 9-13...Winter Meetings
March 13...Begin free signings, trading etc.
March 20.....Roster moves begin, players may be placed on DL if there by MLB team (or prediction is more than 30 days).
April 1.....Season begins be sure line ups are in and legal.
August 11...Minor Draft 6 rounds. Includes foreign signings since July 12 2020. If your drafted player does not sign you lose that pick. (if minor rosters are over the limit due to the draft, GMs have 48 hours to make adjustments)
August 18......ends trading period.
August 20....Ends FA signings.