The Pokémon GO Easter Eggstravaganza runs from April 13th (1pm PDT) - April 20th (1pm PDT) bringing:
double XP from all sources.
a greater variety of Pokémon to be found in 2km eggs.
extra candy when hatching Pokémon from all eggs.
Lucky Eggs will be 50% off in the in-game shop.
For the duration of the Easter event, you will receive double XP from all sources - this includes
catching, hatching, and evolving Pokémon, as well as spinning PokéStops.
This double XP stacks with the Lucky Egg, which can combine to give you 4x the usual XP when playing the game.
This means you'll get an egg-celent 2000 XP every single time when evolving a Pokémon with the Lucky Egg active.
Hopefully you've been saving up your Pokémon that only take 12 candy to evolve: Pidgey, Caterpie, and Weedle!
Greater variety found in 2km eggs
All hatched 2k eggs have an egg-citing chance to contain the following Pokémon: