I will show how to create an event and two copies of the same event.
Events will be seen on Fridays, Saturdays and Sunday from now until December 31st 2021.
Fill in the information you need.
In Date and Time. I filled in the time for the original event and made two copies.
In Repetition Pattern.
Frequency: 1. Period: Weekly. Repeat Until: 2021-12-31.
Filled in anything else that I needed.
Published the events. View Event and went to the My Calendar main calendar.
Here is the frontend December calendar view.
The last weekend was the 26th of December. If I choose to do so I could add another event on Friday the 31st of December.