What is Friar Lawrence doing in Act 2 Scene 3 at the beginning of scene Romeo and Juliet?

In Act 2, Scene 3 of Romeo and Juliet, Friar Lawrence is performing a wedding ceremony as the sun rises. The young couple, Romeo and Juliet, have chosen to keep their marriage a secret from their families, and have come to Friar Lawrence for his help. He agrees to marry them, hoping to bring an end to the bitter feud between the families of the Montagues and Capulets.