Join us for our final open house of 2025 on Saturday, October 4 from 6pm – 8pm! We are celebrating International Observe the Moon Night, which is an annual world-wide program that encourages observation, appreciation, and understanding of our Moon and its connection to NASA planetary science and exploration.

We’re thrilled to be joined by our friends from NASA, who will be providing engaging hands-on activities in our Drake Family Library. We’ll also be joined by the Northwest Suburban Astronomers, who are volunteering their time to provide observing outside on our South Lawn if skies are clear. We’ll have a few special guests for you to meet, including astronomer and Y.O. Speaker Series guest Dr. Julie McEnery, plus engaging science demonstrations and activities, a scavenger hunt with prizes, 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, and tickets can be purchased on our ticketing website. 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. Stay tuned for our official schedule of events closer to the event date!

Get tickets here