There are many events in and around Pittsburgh to commemorate Martin Luther King, Jr. See here for a listing.
WQED and Pittsburgh's Light of Life Rescue Mission invite you to "Celebrate the Spirit of the Rev. Dr. Martin Luther King, Jr." with a volunteer opportunity. Information here.
Also, The Pittsburgh Interfaith Impact Network will hold a rally today at 2:30 PM at Mellon Park (Penn Ave at East Liberty Blvd across from Bakery Square) to "announce our opposition to the Mayor’s actions against the taxpayers and working people of Pittsburgh. The hotel complex in the former Nabisco plant got $13 million in tax subsidies and wants to pay hotel workers minimum wages. We call on City Council to immediately pass the original Prevailing Wage bill again and override the Mayor if he attempts to veto it again." You can find more information/RSVP to the rally here.