Prayer: Held in Private Houses
Source: Nav
Acts 1:13, 14
When they arrived, they went to the upper room where they were staying: Peter and John, James and Andrew, Philip and Thomas, Bartholomew and Matthew, James son of Alphaeus, Simon the Zealot, and Judas son of James. / With one accord they all continued in prayer, along with the women and Mary the mother of Jesus, and with His brothers.
Acts 12:12
And when he had realized this, he went to the house of Mary the mother of John, also called Mark, where many people had gathered together and were praying.