How does one dress for a smart casual/formal end of year party?

I’ve mentioned attending a Jewish party for people with Asperger’s Syndrome. My friends and I are dressing up for it. Should I wear my sapphire ring that my nana left me in her will with my beautiful midnight blue dress, with perfume and makeup? Or is all of that too much, with a beautiful, ornate dress? I might meet a man there, but that’s not the goal.

How does one dress for a smart casual/formal end of year party?
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