To count, there must be at least four people playing and they have to play for real, you can't just cheat it for the market :)

The game doesn't have to use mana as chips (so it can work post-pivot). It just has to be played by Manifold people.

It doesn't have to occur before midnight to count for a day, just early enough in Pacific time that a reasonable person could say that it's occurring on that day.