From version 2.7, you can use GCal for Google Calendar to run a Shortcut when you are using macOS Ventura.
1- Create an event with the title starting by #shortcuts (lowercase) followed by the name of the shortcut.
2- Set the start time of your event.
3- You are done ;)
GCal for Google Calendar will then run your shortcut at the start time defined in your event.
A notification will appear when the Shortcut is running.