I have a better plan. Skip the wedding and go to a bar of your choosing.
But for flasks, I have the perfect solution as this worked for me when I had to wear my Dress Blue Uniform in the Army.
You want something flat with a slight curve so you can keep it on the inside pocket of your suit coat if you wear one. If not, you can easily tuck it in under your belt like a CCW weapon.
Anybody who asks for a hit off the flask or reaches for it gets a broken hand at a minimum.
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