Question about working...

So I've always wanted to work at CP and plan on doing it once I graduate high school. But I was wondering if you can pick specific dates you want to work there. For example, let's say I can start work on Opening Day, but the marching band I hope to get into for my preferred college starts band camp in mid June. Would I be able to work for just this little window of the summer or would I have to stay there all summer? Thanks, and hopefully this will work out for me.

Anything can happen, but in general, the shorter your availability, the less likely you are to get hired.

Considering that Cedar Point doesn't open until mid-May, I very highly doubt any of the departments here would hire someone for only one month.