Nintendo have announced that, once the game is officially unveiled at June's E3 event, the mysterious Nintendo Switch Smash Bros. title will be available to play at various events across Japan.
While there are no further details on the game itself - all that will have to wait until the big reveal - a playable build of the anticipated title will be set up at the following dates and locations:
via destructoid https://www.destructoid.com/nintendo-switch-smash-bros-will-be-playable-at-japanese-locations-next-month-503229.phtml