The players' union and its members decide who attends such gatherings; the league and players met last week in NY in the wake of backlash concerning player demonstrations during the national anthem.
Eagles safety Malcolm Jenkins invited Kaepernick to the first meeting, but he did not attend.
That meeting included 13 current or former players, plus 11 owners and representatives from the league and the NFL Players Association.
In order to win the case, Kaepernick and his lawyer, Mark Geragos, would have to provide clear evidence that two or more National Football League teams conspired to prevent him from being hired. Other players wanted him there, but he decided not to attend because he didn't want to be a distraction.
Michael Strahan says that the intended message of the ongoing NFL national anthem protests has been overshadowed amid the ensuing controversy. However, NFL Commissioner Roger Goodell said that he hopes the number of players who decide to protest would drop to "zero". Many have attributed NFL teams' reluctance in signing him on his political activism and his protest of the national anthem.
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That is what ultimately pushed the league to the meeting table with players in recent weeks, sparked largely by rants from President Donald Trump and recent statements from Dallas Cowboys owner Jerry Jones that discipline should be levied against protesting players. They said, 'I support the players, I support the cause.' But then if you did how could you tell them that they couldn't kneel?
It remains to be seen what impact Kaepernick could have with his direct involvement with meetings.
It was reported in March that Kaepernick planned on standing for the national anthem this season.
Presidents are looked up to by many people, whether Trump believes it or not.
That will be a hard allegation to prove, unless team personnel left a trail of communications indicating collusion.