The Columbia Historical Society sponsor an architectural tour of Columbia Center at 1 p.m., starting at the Gazebo on the town green, routes 66 and 87 in Columbia. A talk by Joan Hill about the founding fathers of the Colonial period prior to 1774 follows at 2 p.m. at the Old Yard Cemetery on Route 87 in Columbia. Sturdy walking shoes recommended. Folding chairs welcome, no pets.