College Pro Days
These are workouts scheduled at college campuses mimicking the NFL Combine. The college programs host this workout to give players that were not invited to the Combine, exposure to the scouts. Those players that did attend the combine get an opportunity to perform again, especially if their performance wasn’t what they expected. This draws the scouts and the other players get the exposure. Sometimes you find a diamond in the rough.
Once the Pro Days are finished in early April, the last remaining item in the draft process is the 30 interviews each team is allowed to conduct at their facilities.