Wedding Sponsor

Hi, I have been trying to plan my wedding and recently found out that I will have to pay for most of the budget myself because my parents are having financial trouble and my fiance has to go back to school and doesn`t have time to work and his parents said they wouldnt be able to help out either so I was looking into getting some sponsors for my weddings.

Is there anyone who can tell me how I could do this, where I would go, ect?