"Attend the Wedding" is an objective in the quest A Match Made on Pandora in Mad Moxxi and the Wedding Day Massacre DLC
Walkthrough[edit]
Head on outside and go to the South of the Rectory. To the right of the Change station you will see a new has opened. Go inside. You will see a hole in the floor. Drop down it and head to the South. You will arrive at Love's Lookout. Head up to the ceremony and things will get under way. They provoke Moxxi some but she keeps her cool.
