Rack's message is entitled "You're Welcome," based on 3 John, which is the disciple's third and final letter and provides a tiny window into church life in the first century.
The service will be held in the air-conditioned Fellowship Hall in the rear of the 126-year-old First Presbyterian Church at Third and East Highland avenues.
"John lifts up the welcoming ministry of the community, especially regarding traveling mission workers," according to the pastor. "At the same time he has critical words to say about a particular self-serving leader who does not welcome others.
"John reminds us that power in the church is based on the authority of Jesus, who distributes it among many servants."
All area residents are also invited to join the congregation as it worships at the Gazebo in the municipal marina on Sunday, Sept. 25.