This has been announced as a series of tournaments headed by Doppio and Rosemi called NijiVersus.
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The first tournament is this Saturday and the game is fashion dreamer, the dress-up game for the switch. The splash art for NijiVersus is only EN livers but there are already main branch livers in this first tournament, for example Rindou Mikoto from JP, who will be one of the judges. Former KR Gaon and Lee Roha, Former ID Hana Machia, JP Onomachi Haruka and VirtuaReal's Tocci will compete alongside several ENs including Vivi as well as Ryoma and Twisty from the new gen.
There's actually prize money up for grabs, but it's only 50,000 Yen, so not an exorbitant amount.
The announcement stream, mostly about this first tournament:
Rosemi and Doppio seem really invested in this and it's a long term thing, so I wouldn't expect her to leave soon. Other people are also very involved in the organization, like Fulgur.
They teased another big surprise at the end of this first tournament "if things go well", which they say has been in the works for about a year.