The NFL has release important dates for the remainder of the 2013 season up to the 2014 NFL Draft. We have the entire calendar posted as a page in our library (see the screenshot at the bottom of this post), but here are some of the bigger dates:
Important Dates on the 2013-2014 NFL Calendar
June 23-29 - Rookie symposium, Aurora, Ohio.
July 15 - Last day for teams to sign their franchise players to a multi-year contract. After this date they can only sign to their one-year deal. Here's looking at you, Ryan Clady.
August 31 - Roster cut-down day. All teams must cut their roster down to 53 players on their Active/Inactive list by 4:00 p.m. MT.
September 1 - After the one-day waiver period concludes following the cuts to 53 men, teams can build their eight-man practice squad.
October 29 - All trading ends for the NFL at 2:00 p.m. MT.
February 2 - Super Bowl XLVIII in New York.
February 4 - Denver Broncos Super Bowl victory parade.
February 19-25 - The 2014 NFL Scouting combine in Indianapolis, IN.
March 11 - Free agency begins at 2:00 p.m. MT.
May 8-10 - The 2014 NFL Draft.
*Thanks to commenter jeffrod for pointing out one glaring omission.
Again, you can view the entire 2013 NFL Important Dates calendar at any time in our library. Just check the screenshot below: