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The way I am reading this, it looks like when this group went to book, they were full, there is no indication that they were 'bumped' for CAIR, on the contrary, CAIR may have booked early.

That is incorrect. Marriott explicitly cited security concerns about the anti-terror conference:

According to the Georgetown Marriott executives, the decision to reject the event, being hosted by the People's Truth Forum, or PTF, was based upon business considerations: "The event would call for heightened security since protesters might be attracted from both the student body and off campus. These same protesters might block the front entrance leading to confrontations with hotel guests and/or room cancellations."

Link