I avoid them like the plague, if I had known I was allowed to skip my highschool graduation I would have without question, but no one told me so I went. I did, however, skip my college graduation, as I see ceremonies as being utterly pointless.
Similarly any large gathering I have the same attitude towards. In highschool pep rallies were mandatory. When one was going on we would miss the last class of the day and be forced to attend the pep rally instead. Before going to highschool, when still in middleschool, we went to the highschool and took a tour and witnessed a pep rally in progress.
Right then I swore that while in highschool I would never attend a pep rally, and I never did. We had them about once a month, and teachers would always patrol the hallways looking for students who were trying to skip them to make them attend.
I would either hide out in the library or just leave school premises altogether, there was a mall across the street, and a large book store down the road. Once I could drive I always just went home early.
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"Knowledge speaks, but wisdom listens."
- Jimi Hendrix