Goku pulls out his phone, and various other communication devices to contact all the folks who's expressed an interest in helping in the fight. He tells everyone a series of coordinates to the big open meadow, that he figured would be a good place to assemble an army, and then he gives the coordinates that he knows to be the main entrance to the lab.
((Final notes. You can PINpoint out, but you can't PINpoint in past the main lobby. All the rooms are separate pocket dimensions, and are only connected physically by their doors, are portals, and need to be opened not smashed. If you have any questions, comments, or concerns, you can go here.