Can you drain a pool during the winter months to replace the vinyl liner in the spring without damaging the pool shell in Mississippi?
If your pool is above ground it does not matter, But if your pool is in ground and you drain it it will act like a boat and float if the water table rises.
I think what you're looking for is the 4th of July. This was not missed during the Civil War, though, but for decades AFTER the was was not a state holiday in Mississippi. County courthouses did not close on the 4th of July in Mississippi until after WWII, because the 4th of July was the day that Vicksburg surrendered during the Civil War, in 1863.
Vicksburg is a town in the State of Mississippi that is located on the Mississippi River. It was the scene of a campaign during the American Civil War in 1863. A city of western Mississippi on bluffs above the Mississippi River west of Jackson. During the Civil War it was besieged from 1862 to 1863 and finally captured by troops led by Ulysses S. Grant on July 4, 1863. Population: 25,700.