The University of Colorado at Boulder's Sommers-Bausch Observatory will host an open house and tour in conjunction with the Historic Boulder organization on Friday, Oct. 20, from 5:30 p.m. to 11 p.m. The free, public events will include a tour of the observatory and demonstrations of the telescopes, dome and other equipment at the observatory. Keith Gleason, the observatory's manager, will give a presentation about the history and preservation of the observatory. The schedule of events includes: