What matters most about your appearance is that you look as if this matters to you - dress in a way that shows you care (i.e., clean, neat, and if possible at least a level up from a regular school day, if not two levels up), and also in a way that makes you feel confident. You’ve already chosen a great level of outfit - IF that’s something you’re comfortable wearing. If you normally wear nail polish, and feel better when your nails are done, then by all means do them. If it’s something you would only do for a really rare occasion, and you’d be overly conscious of them, then don’t. Clearly you already get that it wouldn’t be the time for a super-glitter-gel/individual bedazzle mani. 
So just go with the option that makes you feel best about you.
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