A fly plaid should only be worn when the dress code is either black tie or white tie with a PC or a doublet.
In addition to this, I would only wear one if I were in some sort of “lead” position at said event (the groom at a wedding, the Master of Ceremonies at a Burns Night or the presenter addressing the haggis). They are dramatic and make you stand out. However, most (not all) of the time this isn’t a good thing.
I have had one for 20 years and can count on one hand the amount of times I have worn mine (and one of those was a time as a model when I was asked to wear full formal highland attire!)
They are also challenging, but not impossible, to dance in.
Given that you are just attending the event, even if it is a formal one, I’d leave the fly plaid at home.
I hope you have a wonderful time at your Burns Night!
-See it there, a white plume
Over the battle - A diamond in the ash
Of the ultimate combustion-My panache
Edmond Rostand
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