There are actually three main acquisition periods for the NFL. Free agency in March, the draft in April - which has reached it’s conclusion - and the hoopla of undrafted free agents that aren’t selected by teams. The organizations that can make the most out of undrafted free agents are those that fill out their roster depth the best.
In previous years, Ryan Pace’s Bears have found Bryce Callahan and Cameron Meredith on the undrafted free agent market. They’ve also signed names such as Roy Robertson-Harris after the fact to develop into rotational players.