Watch Online Free FlixHQ. NJPW Wrestle Grand Slam in Metlife Dome 2021 is a PPV from New Japan Pro-Wrestling. It is a two-night event in itself on 4 and 5 September 2021. The event was earlier scheduled for 29 May. But the state of emergency was imposed in Japan due to COVID-19. The first part of Wrestle Grand Slam (in Tokyo Dome) took place on 25 July 2021 from Tokyo, Japan.