Squad Strike Challenge 2023 and amiibo + me Exhibition 2023 will be at Nintendo Live 2023 (September 1st-4th in Seattle, WA)

https://www.nintendo.com/nintendo-live/tournaments/

Super Smash Bros. Ultimate Squad Strike Challenge 2023 - Starting at 12 p.m. PT on Friday, Sept. 1, it’s squad-vs-squad in a single-elimination, best-of-three tournament featuring the Squad Strike game mode open to players ages 13 and up.

Super Smash Bros. Ultimate amiibo + me Exhibition 2023 - Starting at 1 p.m. PT on Sunday, Sept. 3, players ages 10 to 16 and their amiibo fighters can take part in the Super Smash Bros. Ultimate amiibo + me Exhibition 2023 tournament. This single-elimination tournament will feature the top 8 contenders teaming up with their amiibo amigos to fight it out on the stage. Train up your Super Smash Bros. Ultimate amiibo fighter and battle side-by-side to win. The winner scores a trophy and a trip for four to Super Nintendo World – Universal Studios Hollywood.

Also, there's a photo op of the Ultimate mural, and maybe the E3 2018 Smash Bros. items.

Super Smash Bros.™ Ultimate mural - Walk along the extended mural artwork inspired by the game, featuring the complete character roster.

Game-inspired sculptures - Explore real-world recreations of in-game fun from games like Kirby and the Forgotten Land, an Item Gallery from Super Smash Bros. Ultimate, and more.

Interestingly they use the same symbol as the ARMS series symbol in Smash Bros. for the tournaments icon, but without running the game ARMS.