All of Japan's Pokémon Centers are currently closed, and will remain so until September 12th, it has been announced.
The closures began on August 28th, and include Pokemon Stores, Pokemon Cafes, and Pikachu Sweet cafes. Last week, Japan declared a state of emergency in 8 of its 47 prefectures due to rising cases of the Delta variant of the Coronavirus.
According to Poke Beach, this has brought the total up to 21 prefectures, including the Japanese capital, Tokyo. No events will be permitted to take place in these locations until the state of emergency has been lifted.
While September 12th is the proposed date, it's worth noting that it has been extended more than once.