I must admit that the household joke here is that we would rather find a dead snake in the mailbox, than a wedding invitation.
That said, if they are among the closest people in one's life, one simply resigns themselves to shutting up and going.
Weddings and funerals seem to be some sort of cultural duty. We certainly spend bazillions of dollars on them.
I don't know why.
Either you're married or you're not.
Either you're dead or you're not.
I don't get the big ceremony thing.
I got married. That's none of your business. I'm gonna die. That's kinda personal, too.
I know I have a freakishly unique attitude about this. These things mean a lot to almost everyone else.