Yes you can call information they'll put you in touch with the right people and you can schedule it
It is a public facility, you are welcome to walk around and explore. The food ain't too bad. As for a guided tour you might be able to ask the volunteers for a quick tour around. The info desk is just inside the 8th Street entrance on the G level.
I don't know but I am sure you can get more information on this question by calling there
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