Rob, Good advise there from Marlin.
Main thing is to keep it simple, the more work you do the more work it is for you, so...I think your idea of having a Plow Day is fun, so again keep it simple, and enjoy the day.
The local Fire Dept, Boy Scouts, a church group, or some one would probably provide food. Hot dogs, burgers, or a sandwich, plus chips or bars is all the food needed. Then pop and water
And yes a porta-potty is probably a good thing. Have a donation bucket or pass a hat to help cover this expense.
Pick a date so I can put it on my calendar! April 14th works...
Is it Plow Day yet?