Shotgun Wedding is a side questline for the Level 57 content update that was released on September 3, 2015. To start the quest, the player has to purchase the Shotgun Pete's.
||Make Reverend Lovejoy Officiate Quickie Marriages
||"Hm, the collection plate's a little shallow this week."
||"And the church -- more specifically the engine on the model train I keep in the basement of the church -- is in need of repairs."
||"Maybe I can make a little extra scratch on the side... honeymoon-lighting."