The Allegheny Regional Asset District (RAD) is sponsoring RADical days '08 - a yearly event where organizations that receive RAD funding offer free events to the public.
Read more and view an event list here: http://radworkshere.org/interior.php?pageID=42
Personally, I was unaware of this annual event until today. There seem to be a lot of kid-friendly events that young families could experience for free.