Join us for our yearly Messier Marathon open house on Saturday, March 22, from 7:30pm – 9:30pm! We’re thrilled to be partnering with the Milwaukee Astronomical Society, who will provide an educational presentation about Messier objects and marathons, and observing outside if clear. We’ll also have exciting family activities, a virtual reality exploration of gravity, Girl Scout cookies from a local troop for purchase, and more for your family to enjoy.

The open house will take place rain or shine. This does not include use of telescopes within the building. Reservations are required. Tickets for this event cost $5 per child and $10 for adults and are available online only. There will not be parking onsite at the Observatory. Ticket holders must park at Williams Bay School and board an accessible trolley that will run a continuous shuttle between the school and observatory during the Open House.