What are thematic arena tournaments

I don't know what are thematic arena tournaments and it isn't there in the F.A.Q

@TMCA_Jivin_1500 said ^

I don't know what are thematic arena tournaments and it isn't there in the F.A.Q

Thematic like a specific opening as in this tournament. Here its "Italian Game SuperBlitz Arena" with the
opening "Italian Game: Two Knights Defense".
https://lichess.org/tournament/AZpwY8iR

So we should play a specific opening