Open Monument Days Rotterdam: The church will be open 10-17:00 on Saturday the 11th and 13-16:00 on Sunday the 12th for guided tours, quick looks, coffee/tea breaks, organ music (12-14:00 on the 11th) and a used book table. The evening of the 12th a lecture sponsored by the Historical Society of Rotterdam will be held from 17-18:00, with nibbles following. (Please see related event listing.) Do come and pop in for a look around!