# Pokémon Sleep scheduled in-game events > Live situation record from CLSTR: https://clstr.news/situations/pokmon-sleep-scheduled-in-game-events > Updated: 2026-08-17T12:40:57.000Z. Sources: 2. Developments: 2. Pokémon Sleep has announced a series of in-game events scheduled for August and September 2026. In August, a collaboration week running from August 17 to August 24 will feature increased appearance rates for Pokémon including Tinkatink, Tinkatuff, Tinkaton, and Pikachu with a captain’s hat. This period includes bonuses for main skill activation probabilities, sleep experience, and dish vigor. This is followed by the Good Sleep Day #38 event from August 27 to August 30, which focuses on the full moon to provide boosts to Drowsy Power and sleep points, highlighting Clefairy, Clefable, and Cleffa. In September 2026, a special event will allow players to encounter the Legendary Pokémon Mewtwo on Greengrass Isle, including an Expert mode version of the island. The event will feature Psychic-type helper Pokémon and the expected assistance of the Mythical Pokémon Mew. A recurring New Moon Day event will precede the main event to allow players to meet Mew. ## Timeline ### 2026-08-17: Pokémon Sleep announces August 2026 collaboration and Good Sleep Day events Pokémon Sleep announces two August 2026 events: a collaboration week featuring Tinkatuff and Pikachu, and Good Sleep Day #38 centered on the full moon. 2 sources. https://clstr.news/cluster/pokmon-sleep-announces-august-2026-collaboration-and-good-sleep-day-events ### 2026-08-03: Pokémon Sleep to host Mewtwo encounter event in September 2026 Pokémon Sleep will feature a September 2026 event on Greengrass Isle where players can encounter Mewtwo, with Psychic helpers boosted and Mythical Mew aiding research; a monthly New Moon Day event for Mew will 4 sources. https://clstr.news/cluster/the-pokmon-company-rolls-out-new-game-content-for-pokopia-and-sleep --- Cite as: Pokémon Sleep scheduled in-game events. CLSTR, https://clstr.news/situations/pokmon-sleep-scheduled-in-game-events