It looks very much like the press release was from the Discovery Institute not The Freedom Alliance. so who contracted for the showing?
PROMOTIONAL MATERIALS:
It is required that the Event Services Office approve, for technical and factual accuracy, all promotional materials mentioning the California Science Center produced for your event (including invitations, programs, press releases, etc.) prior to printing or broadcast. Please allow sufficient time for this approval.
So it is irrelevant as to who did the press release, it is still a violation of the rental contract. I guess you could say that passage was to be taken literally, and not as an allegory