Saw this, maybe someone here is interested in joining? $10,000 prize pool!
Did not find any rules but they mention that EzQuake should be used so it is QW at least.
"Saturday June 26, 2021 starting at 11:00 a.m. PT/2:00 p.m. ET. We'll be using the ezQuake version of Quake"
Sign up

I've been in contact with the team and it's difficult to get any technical questions answered as they don't know yet - they make up the rules depending on the amount of signups so we'll see what happens.

Probably a good idea to sign up though, no matter what the rules turn out to be!

Sounds good!

Did any europeans participate in this tournament?

More than americans Spoiler

This turned out to be a fun and unconventional tournament.