No Payout Event
It will start automatically even if you are the only trader that entered and joined.
You will need to take note of the Entry Fee (e.g. $2) and the Total Payout (e.g. $3.60). In the example shown, the minimum number of traders needed for it to start would be 2.
All vs All event will need a minimum of 3 traders.
One vs One will only take 2 traders.
Next suggested article: Can I create my own trading event?