The 3rd (of 4) Vintage Online Championship Playoff qualifiers is September 14th. You need 35 format points to qualify for entry (there is no other entry cost), which you can get from doing 3-2 or better in Leagues or from Vintage Challenges.
The prizes for the playoff are really good. Top 8 players qualify for the Vintage format online championship. The Vintage online championship is January 11, 2020 and qualifies you for the pro tour, or whatever it’s called these days, and pays out other really good prizes.