Not to mention completely disruptive to the environment for the patients. An open house would feel like the public coming in to view the animals in the zoo (I'm not calling the mentally ill animals -- just an analogy). One on one, closely escorted, "tours" of the facility for people who are making a decision about hospitalization soon, just makes much more sense, is not disruptive, and is much safer for all involved both physically, mentally, and privacy-wise.