Group Bookings and Reservations A special discounted rate is available for organized groups of 28 or more and for K-12 school groups. To qualify, arrangements need to be made at least one week in advance. Email questions to groups@undergroundmuseum.org or call us Tuesday-Friday between 9:00 am and 5:00 pm to check availability or make reservations. Sorry, but reservations cannot be made via email or online because we want to personally visit with you and be assured of having complete, accurate information in order to guarantee your tour time..