The NFL owns the sporting calendar almost every month of the year with one notable exception.
From the time that the league’s 32 teams finish up the offseason program with mandatory minicamps in mid-June until the start of training camps in late July, the league calendar is mostly quiet outside of a few contract announcements or news that a player has gotten himself in trouble off the field.
The league has tried to fill this dead period over the years by holding a supplemental draft in the summer for players who for one reason or another were not eligible for the full NFL Draft but suddenly find themselves in need of employment at the professional level.