Red cocktail dress for a wedding?

Beginning of November wedding in Nashville. I've heard people express that it's tacky to wear bright red at a wedding, that it looks like you're begging for attention. Which is not what I want at all; I just have this dress from a trip I took recently and didn't get to wear it then. I'm a cousin of the groom, have absolutely nothing to do with the wedding other than attending. I believe the wedding is cocktail attire (and if it's not, I certainly won't be wearing this). Thoughts?

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