You're getting tense Katie: deep breaths!
If you don't have a laptop or even a portable CD player (I think the kids call them Ghetto Blasters or some such) don't fret. Somebody else will and nobody's going to be too busy to get up and change a CD.
(Yes, usually laptops have speakers but you'd still need amplification, bigger speakers, internet connection. Perhaps look for a portable CD player instead, it's easier

)