Leaders of 29 churches in Philadelphia have been invited to participate in an ecumenical prayer service Wednesday at 7 p.m. in the chapel of the Cathedral Basilica of SS. Peter and Paul in center city.

Catholics are encouraged to attend and bring a friend, perhaps a non-Catholic, to pray together in the event marking the Catholic Church’s Week of Prayer for Christian Unity, Jan. 17-23.

The service offers an opportunity for Christians to express their commitment to unity in Christ and with one another in the Gospel. The theme of the service is “Called to Proclaim the Mighty Acts of the Lord” (cf. 1 Peter 2:9).

Parking is available in the parking lot adjacent to the cathedral. Clergy are asked to go to the sacristy to vest for the service.

The cathedral is located at 18th Street and the Benjamin Franklin Parkway in Philadelphia.