Actually Tater day is not just a day to eat Taters! It all started in 1842, People would get together to have a day of selling and trading potatoes! You can read about it here: http://www.explorekentuckylake.com/lakesarea/events/taterday.htm and there's also a page on Tater day on Wikipedia.
We for Tater day just ate sweet potatoes! I made sweet potato fries.
Just peel and cut up four sweet potatoes, Cut them what ever size you want your fries to be. Put one or two tablespoons of oil into a Nine by Thirteen baking pan. Place all the potato slices onto the pan. Sprinkle salt, pepper, onion powder, and chives on top of he taters. Put in oven on 350 Fahrenheit. Take the taters out of the oven half way through and with a spatula flip all the taters and put back in the oven for them to finish baking. When they are as soft and browned as you would like take them out, serve, and enjoy. (This served our family of six)