Somebody near by...Putt to a friend.
A gut shot putt usually works great!
At the NT this weekend, the practice baskets were full and there was trash talking, so one of the players broke away and got a spectator to putt at. They knew each other and he got his putting warm up done without interference.
Mid sixties using our frisbees to shoot into Cow hay feeder,similar to pole baskets today,just higher basket shoulder height,tin roof to keep rain off.early object/target dg.Local park also had a fire bell ,ring the bell for your ace