Apparently the lots open at 6 PM and close at 10 PM if you get there later than that you will have to wait till 7 AM for them to open again.
So far the plans are Dan leaving at 3pm and AdamB leaving at 6pm from Des Moines/Ames
I don't know when I am leaving yet, I am hoping to drive with another bus if I am ready in time.
Parking information can be viewed here:
I snuck into A2 two years ago.