Gathered together praying

And when he had considered the thing, he came to the house of Mary the mother of John, whose surname was Mark; where many were gathered together praying.
(Acts 12:12)

Five occasions when people gathered together for prayer.
Why they gathered and the outcome.

1/ For another in great need - Acts 12:12 .
2/ Continuing in prayer - Acts 1:14 & 16:13 .
3/ Thanksgiving - Acts 4:31 .
4/ Saying goodbye, taking leave of one another - Acts 20:36 & 21:5 .
5/ Dedication of a building - 1 Kings 8:22 .
6/ National trouble - 2 Chronicles 20:3