harry potter vs cpr training

So I just realized today that I am signed up for a CPR class on July 16. The problem with this is the new Harry Potter book comes out on the same day, the CPR class would run from morning all the way till six. After this I would have to eat dinner, and by then I would be way behind in reading Harry Potter.
So now I have to decide if I should ditch the CPR training and do it another time, or start Harry Potter late. The problem with ditching hte CPR course is I wont even be working at the YMCA much longer and I think I'm required by law to take the first availible course.
Tough choice; reminds me of choosing colleges.