The Origami Club of Pittsburgh holds origami classes on the third Saturday of each month at the Carnegie Library in Squirrel Hill. The beginners class is from 12:00 to 1:30 pm in the Children's Room, and the Advanced Class is from 1:30 to 3:00 pm. The classes are free, though the group requests $1 donations from adults in order to cover the cost of supplies. More information on their "class guidelines" page.
The OCoP will also have origami demonstrations at Phipps Conservatory in Oakland (map) on December 16 and December 30, from 12:30 to 2:00 pm.