Darrelle Revis is expected to be one of the marquee free agents on the market.Getty Images

A look at the most important dates on the calendar for NFL teams in the spring of 2015:

Saturday, March 7: Free agency begins as teams are allowed to contact and enter into contract negotiations with agents of players who will officially become unrestricted free agents at 4 p.m. on March 10.

Tuesday, March 10:Player contracts can be executed with new clubs at 4 p.m.

Thursday, April 30: 2015 NFL Draft Round 1


Friday, May 1: 2015 NFL Draft Round 2 - 3

Saturday, May 2: 2015 NFL Draft Round 4 - 7