Can't I pick up their permits and give them to them later when they show up at the Portal?
Are you referring to the "luggage tags" for the packs?
The actual permit is a contract between the group leader and the Forest Service. As the group leader, you have to be at the
Eastern Sierra Interagency Visitors Center to sign the permit, but not everybody in your group has to be there for you to get their tags and wag bags. You still are responsible for the conduct of everybody in your group.