Badminton Tournament?

I'm currently a senior in High School taking a Badminton Cl at school.I'm an Okay player but i have a really Bad serve. Today it took me 3 times just to get my serve over the net.But otherwise i'm an okay badminton player. But theres a tournament in cl tomorrow and i want to enter.Obviously praticing before hand isn't an option because i don't have a net.How can i enter this tournament tomorrow and not feel like a total clown in front of everyone because i can barely serve. advice? or suggestions?