In this festival it is basically an Easter egg hunt. You run around searching boxes for the egg color the mayor has selected. Go up the box and press A, if the egg matches the color the mayor was looking for then bring it to the mayor for confirmation and you will move on to the next color. After a while the contest will be over and as long as you found at least two eggs you probably win. Prize in year one is a power berry, any other year month of fodder.