Before you can embark on the epic adventure to unlock Peter Pan in Disney Dreamlight Valley, you need to complete the Poetic License quest and have the A Forgotten Name quest available. To do this, you'll need to meet the Forgotten anywhere in the valley, where they'll tell you that they've found a red feather outside of Skull Rock, which the two of you should investigate...
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How to unlock Peter Pan in Disney Dreamlight Valley
Source: PC Gamer (opens in a new tab)