What chain of command? Are you in the Military here?
LOL! No, BUT any scenario has a chain of command. For example, if you are doing a wedding, you MUST determine who your boss is, and everyone responds to someone else...
SO, lets say you are told to answer to the bride. The bride is your boss. You work for the bride. If someone (like a guest) asks you to do something, you have to be sure it is ok with your boss.
THE BRIDE is responsible for dealing with the venue. The venue operator is not my boss. THEREFORE, if I contract a time with the bride, and I determine that ending time is the SAME ending time contracted with the venue, it is MY JOB and responsibility to end on time.
HOWEVER, for an example, if the bride has the room to 12 and we are done at 11, and she want me to play to 3 people for the last hour, but the venue manager wants me to shut down so he can send staff home, it would be, according to chain of command, incumbent upon the manager to tell the bride he wants to shut down, not me. She legally has the room to 12, and it is not my place, my job or my responsibility to shut down the party.
Chain of command is IMPERITIVE to identify, especially in weddings. You have to know who has final decision process, the mother, the bride or the manager or the banquet facility, LOL.
Dont assume the person writing you the check is the boss either! Many times I have contracted brides and had the mother contradict the brides wishes because "she was paying me". I clear that up at contract time.
Chain of command is an important leg of the contract process, and "c'ing your A".