You are overthinking this just about WAY too much. It's a date in nice clothes. But you are bringing back a memory. In my freshman year I asked a fraternity guy to fall party (a semi-formal I suppose) who I'd gone to school with from 1st grade. He said yes and then backed out. When we were SENIORS he finally told me his fraternity brothers had made a huge thing out of it, that it meant we were dating, all that. And of course we were just friends so he felt trapped and bailed. Don't be that kind of a dork. It's just a party, and your friend, 2 years your senior, certainly knows that. If you mean junior in high school, you'll have to be more clear that it's just a party and not prom. But still, Knight Shadow pretty much has it down. As he always does.
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"Traveling - It leaves you speechless, then turns you into a storyteller. ~ Ibn Battuta
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