The egg festival happens the 13th of spring, at 9:00 am at the Pelican Town Square.
The villagers and you participate in a traditional egg hunt; there's a booth where you can buy a stuffed rabbit (it's for decoration) and strawberry seeds (100g each).
Once you talk to the mayor, the hunt begins. You have 30 seconds to collect a minimum of 9 colored eggs or Abigail wins the festival.