How many bell ringers does it take to swing the 6.5 tons-heavy bell of the Church of Our Lady before Týn? What is the sound of its voice? We'll find out from a true expert! We will go to Old Town Square with Ondřej Boháč, bell ringer and director of The Prague Institute of Planning and Development. We will climb 186 steps up the tower and immerse ourselves in the Christmas atmosphere. The programme is intended for children from 8 to 18 years of age without accompanying adults. The meeting time is at 15.00 at CAMP, returning at 18.00 to the same place.