August 30: Teams must reduce their rosters to a maximum of 75 players by 4 PM ET.
September 3: Teams must reduce rosters to 53 players by 4 PM ET
September 4: Teams may establish a practice squad of 10 players
September 8-12: Opening week of NFL schedule
November 1: NFL trade deadline at 4 PM ET.
November 27: 104th CFL Grey Cup game; 6 PM ET; Toronto
December 31: College playoff games; Fiesta and Peach Bowls
January 9: College football national championship game; Tampa
January 16: Deadline for underclassmen to apply for special eligibility for the 2017 draft
January 19: Window closes for underclassmen who applied to the NFL for early entry to the 2017 draft who have not signed with an agent to withdraw their names.
January 21: East-West Shrine All-star Game, Tropicana Field, St. Petersburg, Florida
January 23-28: Senior Bowl week, Ladd-Peebles Stadium, Mobile, Alabama.
January 29: Pro Bowl in Orlando
February 5: Super Bowl LI in Houston
February 9: Teams can begin to release veteran players
February 15: First day to tag franchise players
February 15: NFL signing period for CFL players under contract ends
February 28-March 6: Scouting Combine in Indianapolis
March 1: Deadline for teams to designate franchise or transition players
March 7-9: Three day window in which teams are permitted to contact and begin contract negotiations with the agents of players who will become unrestricted free agents
March 9: 2017 league year, include start of free agency and trading period begins at 4 PM ET
April 3: Offseason program can begin for teams with new head coaches
April 17: Offseason workouts can begin for teams with returning head coaches
April 27-29: 2017 NFL draft in Philadelphia