Whacking Day invades your town with snakes. To begin this event, you need to complete the quest that requires Homer to go on a whacking spree and requires Lisa to do next week's homework. These are 24 tasks so as soon as they become available, assign them.
After that, you'll be able to enter Whacking Mode at will. Tap the snake in the top right corner of your screen and then tap on any snakes you see slithering around Springfield. Each snake you whack will either give you a snake to trade for prizes or an egg you can place in a friends town to help them with their snake-whacking totals.
Some of these eggs contain donuts, so be sure to be nice to your fellow Tapped Out friends until May 9th when the event ends. There are 10 prizes for whacking snakes, but try to earn them by trading in snakes. The more items you buy with donuts, the more expensive the prizes get.
Besides, if you're starting the Whacking Day event this early, you should probably have just enough time if you're dedicated and keep a close eye on your Springfield.
Wanna know what all the new Whacking Day items do and how much they cost? Check out our Whacking Day Item FAQ
Wanna know what all the Whacking Day prizes are and how much they cost? Check out our Whacking Day Prize FAQ