A day after closing out their 2016 season, Broncos players arrived at the team’s Englewood headquarters to clean out their lockers, turn in their playbooks and prepare for an off-season of change. Here’s a primer on what lies ahead:

KEY DATES

(Player contract information via Spotrac, Overthecap and The Denver Post)

Jan. 2-May 3: The Broncos can extend or exercise the fifth-year contract option on cornerback Bradley Roby. Fifth-year option salaries differ depending on the player’s draft slot and position. For players drafted Nos. 11-32, like Roby, the salary is the average of the third- through 25th-highest salaries at a player’s position. Last year, the fifth-year salary for a cornerback chosen No. 11-32 was $8.026 million. The option is guaranteed for injury and becomes fully guaranteed once the fifth contract year begins (in March 2018 for Roby).

Jan. 8-9: Assistant coaches of playoff teams that have first-round byes can be interviewed for head coaching positions through the end of the wild-card games.

Jan. 10: Coaches of non-playoff teams can begin to discuss employment if their contracts are set to expire.

Jan. 15: Assistant coaches of playoff teams that won their wild-card games can be interviewed for head-coaching positions through the end of the divisional playoffs.

Jan. 28: Senior Bowl at Ladd-Peebles Stadium in Mobile, Alabama

Jan. 29: NFL Pro Bowl at Camping World Stadium in Orlando, Florida. Three Broncos players were selected: Cornerbacks Aqib Talib and Chris Harris, and outside linebacker Von Miller.

Feb. 5: Super Bowl LI at NRG Stadium in Houston.

Feb. 6: Waiver system begins for 2017.

Feb. 15-March 1: Teams can designate franchise or transition players. Franchise tags are fully guaranteed one-year deals with set salaries based on a player’s position. Teams can designate one franchise or transition player. The deadline to designate one is 2 p.m. on March 1.

Feb. 28-March 6: NFL scouting combine at Lucas Oil Stadium in Indianapolis.

March 7-9: Free-agent negotiation period. Teams can open talks with certified agents of players who will be unrestricted free agents.

March 9: The 2017 league year and free-agency period begin at 2 p.m., meaning any agreed-upon deals during the negotiation period can be signed. The trading period for 2017 also begins at 2 p.m. Prior to 2 p.m. teams must:

• Exercise options for 2017 for all players that have options in the contracts and submit qualifying offers to restricted free agents with expiring contracts.

• Submit minimum salary tender to exclusive rights free agents with expiring 2016 contracts

• Be under the 2017 salary cap, projected to be between $163 million and $165 million, according to ESPN.

March 9: Deadline for the Broncos to exercise LT Russell Okung’s $1 million option for 2017. If exercised, Okung’s $2 million base salary for 2017, $9.5 million base salary for 2018 and $8 million roster bonus all become fully guaranteed, for a payout of $19.5 million. He can also earn up to $1.5 million in per-game roster bonuses.

March 13: OT Donald Stephenson’s $4 million salary becomes fully guaranteed. Stephenson has a $5 million cap hit for 2017 with $2 million in dead money if released, which means the Broncos would save $3 million in cap space if he’s cut before this deadline.

April 3: Teams with new head coaches can begin ofseason workouts.

April 21: Deadline for restricted free agents to sign offer sheets.

April 27-29: 2017 NFL draft in Philadelphia.

July 15: Teams must sign franchise players to a multiyear deal or extension by 2 p.m. After the deadline, players may sign only the one-year franchise contract in order to play in 2017.

Mid-July: Training camps open.