DOUBLE STARDUST!!!
From 1:00 P.M. PDT on September 22 to 1:00 P.M. PDT on October 2, 2017, you’ll have the opportunity to earn double Stardust for catching Pokémon and hatching Eggs as you walk around your neighborhood discovering new sights. While you’re out exploring, be sure to visit your local PokéStops and Gyms to collect special 2 km Eggs that have the opportunity to hatch Pokémon such as Chansey, Mareep, Larvitar, and more. You’ll also be able to get special boxes from the in-game shop that feature items like Lucky Eggs, Lure Modules, and all-new Super Incubators which hatch Eggs 1.5 times quicker!
Celebrate the Equinox! - Pokémon GO
http://pokemongolive.com/en/post/equinox2017