March 14 — 2018 league calendar begins, free agency opens, trades allowed.
March 25-28 — Annual league meeting, Orlando, Fla.
April 2 — Clubs that hired a new head coach after the end of the 2017 regular season may begin offseason workouts.
April 16 — Clubs with returning head coaches may begin offseason workout programs.
April 20 — Deadline for restricted free agents to sign offer sheets.
April 26-28 — NFL draft, Arlington, Texas.
May 21-23 Spring league meeting, Atlanta.
For more NFL coverage: http://www.pro32.ap.org and http://www.twitter.com/AP_NFL