I don't want to go to my cousins concert
Why would you want to skip your cousin's concert?
They always play some classical music and I never liked it.
It is good to be supportive of your family. I'm sure you can handle music that you don't like for a little while.
I can't stand that stuff. Maybe I'll go in a gorilla suit to distract the cellist.
I'm glad that you're willing to consider attending the concert, but you shouldn't try to ruin it. You should want your cousin to have a successful concert. You're quiet attendance is enough to show her you care.