These are used when Dr. Frankenfurter and Rocky are 'wed' to each other. It helps to be near where the actors will pass by for this to be exciting. These are used when Dr. Frankenfurter and all the guests are in the laboratory, right before the 'creation' of Rocky.
Some people wear party hats here too.
These are worn during the dinner scene where Dr. Frankenfurter sings 'Happy Birthday'. This is a very simple item. It is 'tossed' about during the dinner scene when Dr. Sometimes there is a lot of enthusiasm during this scene.