Carousing means to drink a lot of alcohol and enjoys themselves with others in an noisy way, Lamenting means mourn a persons death.
That is a little hard to answer but if a had to say, at is like telling someone where something is and on is like an object is over another object. It is a little hard to explain
I believe the answer is full of drama
I apologize if this is incorrect or not what you are looking for.
To interpret how a character sounds and acts to move scenery on stage.