How did the whole church in Antioch come together to hear Paul and Barnabas' report?
Acts 14:27 (ESV)
27And when they arrived and gathered the church together, they declared all that God had done with them, and how he had opened a door of faith to the Gentiles.
The church in Antioch was either small enough to meet in one large house, or they gathered in a public space.1
27 And when they arrived and gathered the church together, they declared all that God had done with them, and how he had opened a door of faith to the Gentiles.