I've always wondered why they haven't used it... it's a huge theater venue just sitting there unused for HHN.
I know it's a pipe dream and will never happen, but I still argue the best use of the venue for HHN would be to show key excerpts from the 1959 movie The Tingler, and have seat effects as William Castle would have intended. That'd be amazing, and basically the only place that could get away with it (both in terms of atmosphere and physical effects).