You do not need a license to come to open track. This is how it works:
If you do not have a license or this is your first time at this event you must arrive in the morning to take the prep class etc.. from 8am-10 or something. After taking the class in the morning, you will run in the open track for the rest of the day.
If you have already been to this even or have a license then you just show up at 11am for the open track.