When I first started planning, I was shocked at the cost of catering! If a full dinner is going to be impossible for you then consider hosting a swanky cocktail party instead or a decadent dessert reception or a wine tasting. All would make a lovely wedding celebration. I just saw this Ice cream parlor reception on 100 Layer Cake and thought it would be another great budget-friendly option.
Just make sure to have champagne and I'd hunt for ice cream from a local creamery.