There are two annual events that many/most locals dread: Sturgis and Mardi Gras. For the same reason.
See flintlocke's post on page 3 or so.
Although the local businesses are surely hurting this year. Booze sales at the big grocery are easily going to be WAY down year over year.
Fuel and bottled water too.
The Burners bring a big wad of cash to our little county every year.