The Cleveland Museum of Natural History stays open until 8 tonight to feature special programming, including current science presentations, gallery talks, up-close looks at the museum’s animals, in-depth conversations with curators and special guests, and access to the Ralph Mueller Observatory, weather permitting. The events are free for members. For nonmembers, normal admission rates apply, and guests who purchase a ticket at any time on Friday are welcome to stay past 5 p.m. at no additional cost.