This is NOT a formal Meetup but a fun suggested activity. Register yourself ($12) or organize others to join you! We were told about it when we did a photo walk on the South Side. Good opportunity to wander the South Side slopes safely and with others that know the way on marked routes.
"In its 13th year, the Pittsburgh StepTrek will begin Saturday, Oct. 5 at 11AM at South Side Park (Josephine & 21st Streets) on the South Side. The event has lasted this long due to the backing of individuals with a curiosity as to what lies at the top or bottom of the numerous public stairs in the neighborhood."
More info here: