I went to City Hall today to ask the details about lining up for next thursday and this is what I was told:
-park opens at 9:00 AM and closes at 11:00 PM
-parking structure opens at 8:00 AM
-security will not allow any line-ups outside the bag check tents before 7:00 AM
so if you want to line up first you'll have to park elsewhere and walk in.