At SFA, they have a single Season Pass processing station in their guest relations building that is open all the time. If you go into guest relations, one of the staff at the desk just takes you to do the pass. They have the regular season pass office closed though. So at SFA you can get season passes processed anytime, whether the season pass processing building is open or not...HOWEVER, I'm not sure if SFGAdv is set up this was as well, so I can only give you the advice that everyone else has given. Call the park and hear straight from the horses mouth.
If you can't stand the heights, get out of the line.