He hopes that it will reconcile the feuding families. Which it does, eventually.
Friar Lawrence is sure that Romeo was at Juliets all night.
It was both Romeo's and Juliet's idea to marry eachother.
The plan is that his brother Friar, Friar John, will take a letter to Romeo. But Friar John is prevented from giving him the message.
There were no guests, no witnesses, no bridesmaids, no photographers, no ushers, nobody at all except Romeo, Juliet and Friar Lawrence.
Friar Lawrence organises for Friar John to bring Romeo news of Friar Lawrence and Juliets plan (Act Five, Scene 1)
Friar Lawrence married Romeo and Juliet in his cell.
friar Laurence
The name of Romeo's spiritual advisor is Friar Lawrence.
Romeo, Juliet, and Friar Lawrence are in Friar Lawrence's cell.
Friar Lawrence wants Romeo to do different things depending on what part of the play you are talking about. When they first meet, the friar tells Romeo to go slowly in his relationship with Juliet (as if!).
Friar John got sent back to Verona because of the quarantine he encountered on the way to Mantua.
The audience knows that Romeo has a close relationship with Friar Lawrence because Romeo confides in the friar about his love for Juliet, seeks his advice on important matters, and trusts him with their secret marriage. The friar also plays a key role in helping Romeo and Juliet be together, showing a deep bond between them.