City of Mason issued the following announcement on Sept 29.
Kids are encouraged to travel through the City Open House, this Saturday, Oct. 2, 10 am to 2 pm! Collect stamps from different departments in your City Traveler passport and gather goodies along the way. The passports are provided at the Registration table the day of the event. City Residents can enter their completed passports in a drawing to win a visit from a public safety vehicle for their birthday, a ride in the Holiday Parade, or a free park pavilion rental.
Original source can be found here.