Faeries can be purchased in Town Square - 500 crowns each for limited time. There is currently no way in the game to acquire crowns except event participation and I suspect most people already spend their allowance on other walkers. I wish we would get a bit better information about how people will get crowns to acquire those faeries. (will they be awarded at specific times during the event, will the fully built Cove start a regular drop, anything else?).
Is this goal possible for players with low energy resources?
Without buying an energy pack?