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Do we have this one already?
Most schools in fictionland and in Real Life have at least some time off. Sometimes it's only a month, other times it's several. The time of year often varies - sometimes it's at the end of the Calendar Year, or it's Summer.
However, sometimes, a character may be required to go to school during the school break. There are many possible reasons for this - maybe due to an illness they couldn't go to class and were too far behind. Or maybe they are Book Dumb and are at risk of being Held Back in School, so they sacrifice most of if not all of their holiday break(s) to make up their missed work and material. Or maybe they cut too much school.
As a result, there's a certain stigma about having to attend school during a holiday - most Summer School (in North America) programs are known for being where the "stupid kids" go and thus Acceptable Targets. While it may not always appear in person during the work, the specter of it may be the motivating factor of the episode where our character has to study. This carries less of a stigma in higher education. A kid in high school in school over the holiday will be laughed at and often portrayed as dumb - whereas a college or university student will be portrayed much more responsibly for choosing to take summer classes.
Sometimes, however, it's actually done for a different purpose - sometimes there may be a school program that runs during the holiday - such as Band Camp.
Examples that I can think of: