I'm not sure if people know about this so I will post it here.

https://www.manatraders.com/manatraders-series.html

They're going to run an online Vintage tournament at some point with a $15,000 payout. And there's not even an entry fee. And you don't need to be a manatraders subscriber.

It does seem that the prizes are discriminated though. Meaning, if you're not a manatraders subscriber you only get $500 for first place. If you are a subscriber, you get $5,000.