Large wedding, low budget. How do we manage this?

I have a very large family. My significant other, however, has very little family members. I will try my best to get the guest list down to 250 or 300, but it may very well exceed that amount, being that I have so many family members. We don’t want to spend a terrible amount, but we want to make sure that everyone has a wonderful time. My cousin will be catering the wedding (African food and Italian food will be on the menu), and she said it’d be close to $1000. I think that is going to be our biggest expense. Any ideas on how to have a wedding that isn’t going to cost us a crazy amount?