Can I sign in more than 3 people with Main Entrance Pass?

If I make 2 reservations on the same day, can I sign-in more than 3 people at a time? I have family out of town, and I'd like to get 5 people in without using comp tickets. I'm just not to keen on how exactly it'd work, but I saw that I could make another reservation on the same day, so maybe I could just use it to sign-in more people at time? Idk, help pls.