Go to ‘Basics’ in your event for advanced settings
Click on an event in “Events”
In the left sidebar, click on “Settings”
Then, select “Basics"
Click on the ‘Settings’ dropdown at the bottom
Sales Start Time
This setting determines when ticket sales begin. Choose whether sales should start immediately or at a later time.
Now: Sales start immediately.
Later: Set a future start time, which will display a countdown timer until sales begin.