Who does one contact if one wants to plan for a group to view museum at the same time?

You can call group sales.

All of the information regarding visiting the museum as a group is on the museum's website. Emails are usually answered within 24 hours.

To my knowledge, you either wait in line, order online, or pay for a tour. I think we saw a few different ones on Google. We used KB tours, did a great bus tour seeing the related sites (for like 20 ppl) and got the passes from them at the end to spend the rest of the day in the museum.. just walk right in.