Niantic is continuing to host Legendary Raid Hours with rare Legendary Pokémon in Pokémon GO every Wednesday from 6 p.m. to 7 p.m. local time. However, Niantic has shared the below update regarding in-game Raid Hour events:
Updates to events: Raid Hour
The following events have been canceled, postponed, or changed.
- Raid Hour: This event has been canceled.
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—The Pokémon GO team
Source: Official Pokémon GO blog