Just be out at the Monorail area by 6:50 or so. Chances are the automatic doors will be turned off. When the station CM opens the door, let them know that you have a 7:00 PS at the Contemporary. They will do what they can to expedite your trip. However, be aware that at that time of the morning, the trains are just coming online, and safety checks may still be happening. You probably will arrive a few minutes late to your PS, but thats no big deal. Just let them know you got stuck on the monorail, and you'll be fine.