Get Bernie Sanders come to notoriously cold Bloomfield, Vermont, where, according to http://www.weather.gov/media/btv/climo/extremes/extremetemps.pdf , the lowest temp recorded in Vermont was -50 Farenheit on December 30th, 1933.
Ask everybody to show up in button-up sweaters and jackets (no zippers!) in Bloomfield, and Bernie talks about Button-Up Day. Maybe you can get some donated hot chocolate donated to hand out.
And somebody (a local singer with a high school band) performs "Button up Your Overcoat."
Or maybe you run a little talent contest - for the best rendition of "Button up Your Overcoat?"
Most important: Get the media there! (That's the whole point of the event! But you knew that.) 8-)