Non-religious couple trying to please Catholic family. Help!

My fiance and I grew up in catholic families. However, neither of us are religious and don't need a religious ceremony. His father is very much religious and is requesting that we have a priest. I was willing to agree to this request. However, he was also under the impression that we would marry in a church, but we are not. I've heard it can be difficult to get a priest to perform a ceremony outside the church. His father asked if we would cancel our venue if we couldn't get a priest. I am not willing to do that and my fiance agrees. I really don't want to start my marriage upsetting my father-in-law, but I also need him to respect what we want. I feel that I don't need a priest to tell me that my marriage is valid and I don't want a mass. I guess I am just looking for advice on the situation. Is it possible to either have a priest at our venue or could one bless our marriage if we have a non-religious ceremony?