I don't go to the wedding I RSVPd for because I got free tickets to a baseball game
Why did you change your mind about going?
I hate weddings and I would rather watch some baseball.
I'm guessing you RSVP'd before you got the baseball tickets. I'm sure the ball game would be a lot more fun, but if you made a commitment to go to the wedding, you should probably keep that promise.
I already said I hate weddings. It's not a big deal.
You should try to at least show up for the ceremony itself. You made the commitment to go. At least tell the bride and groom you won't be able to make it, if you want to go to the ball game that bad.