Eggstravaganza in 2017 is the first Eggstravaganza event in Pokémon GO.
Trainers received double XP and, if a Lucky Egg was active, the amount of XP received would be be quadrupled. 
A greater variety of Pokémon could hatched from 2-km Eggs, and the amount of candy received from hatched Eggs was also increased.
Only these, following Pokémon were hatching from Eggs during the event. After this time the all hatchlings were the same as prior the event. 
Shop special offer
There was special offer available in the shop. The cost of Lucky Eggs were 50% off during the event.