My son (2018) went to Philly Freshman last year and it was very worth it. You can not just apply as someone stated. My son needed an invite from his club coach. His coach was given 5 invites only. The other players on his team had to try to get invites from their high school coaches. If your son can get an invite, I would seize the opportunity. If your son can't, do not stress. There will be other opportunities in the spring/summer. Blackcard and Maverick both need invites and are worth trying to get one for.