I don't want to go to the wedding of my wife's childhood friend.
Why don't you want to go to the wedding?
I hate wearing suits, and it will probably be boring.
If you have received an invitation to attend a wedding, it is important that you attend unless you have a very good reason not to like a scheduling conflict. If you do not attend the wedding of my wife's childhood friend, your wife's relationship with that friend will become strained. You should attend the wedding so that your wife can maintain her friendship with her childhood friend.
But it is a 50 days away.
She wants to go so you should support her. In the grand scheme of things it is 1 day and they probably have an open bar. Just go and have fun.