I'm sorry for the inconvenience.
As you have seen, around the regions you can find these eggs that will be useful for the Easter Event. However they cannot be used yet.
Unfortunately i'm sorry to inform you that i cannot disclose any information about the event, this because we want to make players discover everything by themselves when everything will be released.
Keep in mind that once everything will be started and any future update/feature/event released we will make an announcement on our OFFICIAL PRO DISCORD, therefore you can stay tuned there.
Let me know if you have any further questions.
Have a wonderful day !