The society was formed in 1969 by a local Jim Smith to celebrate one of the most common names in the U.S. Today, the group boasts about 1,900 members.
About two dozen Jim Smiths plan to go sightseeing and visit Pittsburgh museums.
They're also holding a golf tournament on Friday to kick off the festivities.
To join the Jim Smith Society potential members must, naturally, be named Jim Smith, but even this rule is flexible. Two women, both named Jimmy Anne Smith, have joined. Jamie also is an acceptable name.