Should i skip my Bil's wedding?

My BIL is getting married and long story short, we don't get along. We used to until he started dating the woman he is now marrying. She has completely divided the family. My BIL and his fiance do not speak to me or my husband and do not express any interest in building a relationship with us. Mind you, my husband and I have put in A LOT of effort and brought up how important a relationship is to their attention time and time again, and they have chosen to ignore us. They chose a wedding date but haven't mentioned it to us but have told everyone else. I am very close with my SIL and my MIL/FIL. The wedding is a ways away, but I am honestly thinking of not going if this is the status quo. I get I should support my husband but what happens when part of his family doesn't support us? It just doesn't make any sense to me. Of course my husband should go, but I feel like I could come up with a reason not to since it is out of state. Thoughts and opinions?