The purpose of No Flag Golf is to learn the importance of getting the ball on the green. It’s a great game if you are trying to break 100 or 90.
Simply have the group in front of you take the flagstick out and play to the middle of the green on all shots until you get close enough to see the hole, which is about 30-yards.
I’ve done this in junior camps, with adults and even college players. They all hit more greensand avoid making big numbers.
Give it a try and let me know how it works!