February
February 20: First day for clubs to designate franchise or transition players.
February 27-March 5:
NFL Scouting Combine, Lucas Oil Stadium, Indianapolis.
March
March 6: Prior to 4:00 p.m., New York time, deadline for clubs to designate franchise or transition players.
March 12-14: Two-day legal tampering period. Teams may enter into contract negotiations with agents representing the players who will become free agents at 4:00 p.m., New York time, on March 14.
March 14: The deadline for all teams to exercise option clauses and submit offers & tenders to their 2017 RFAs & ERFAs occurs at 4 p.m. EST. All teams must be under the salary cap with their top 51 players.
March 14: The 2018 league year, free agency period, and trading period begins at 4:00 p.m., New York time.
March 25-28: Annual League Meeting, Orlando, Florida.
April
April 16: Clubs with returning head coaches may begin offseason workout programs.
April 20: Start of NFL's annual substance-abuse testing program. All players under contract with an NFL club will be tested once during the period beginning April 20 and continuing through August 9.
April 20: The deadline for Restricted Free Agents to sign offer sheets.
April 26-28:
2018 NFL Draft, AT&T Stadium, Arlington, TX. The
Cowboys currently hold the 19th overall pick. In addition to their regular draft picks, the Cowboys should have an
extra four compensatory draft picks in the 2018 draft.
May
May 4-7 or May 11-14: Clubs may elect to hold their one three-day post-draft rookie minicamp from Friday through Sunday or Saturday through Monday.
May 21-23: Spring League Meeting, Atlanta, Georgia.
End May - early June: Voluntary OTAs begin (veterans and rookies). Teams may conduct a total of 10 days of organized team practice activity. No live contact is permitted, but 7-on-7, 9-on-7, and 11-on-11 drills are allowed.
June
Mid-June: Mandatory Minicamp (veterans and rookies)
Late-June: Rookie Transition Program to be held at individual clubs. Attendance is mandatory for all rookies.
July
Mid-July: Clubs are permitted to open preseason training camp for rookies and first-year players beginning seven days prior to the club’s earliest permissible mandatory reporting date for veteran players.
End-July: First possible practice of training camp is 14 days prior to each team's first preseason game.
August
August 2: Hall of Fame Game, Canton, Ohio.
August 2-5: Hall of Fame Weekend, Canton, Ohio. Terrell Owens will be honored in the Class of 2018.
August 8-12: Preseason Week 1.
September
September 1: Clubs must reduce rosters to a maximum of 53 players by 4:00 p.m., New York time.
September 2: Clubs may establish a practice squad of 10 players.
September 6, 9-10: Regular season opens. The exact dates and times of each game have yet to be released, but the
Cowboys’ 2018 home and road opponents are already set.
https://www.bloggingtheboys.com/201...draft-training-camp-and-other-important-dates