Should i go?

I recieved a msg from my CCA teacher reminding me tt there'll be a CCA practice tml but becuz i didn't attend e last thursday practice,she ended e msg saying if i fail 2 attend e practice tml without valid reason,i'll ve to face discipline action.I really hate this man.Just once in a while i fail 2 attend and she could just simply send this msg 2 me.It makes me wander if i should go or not.Just can't i have some 'freedom'?