The reason for this is your payed on a tip pool, and the banquet manager tries to get you out of there in as few hours as possible so she can line her pockets with more money, yes she takes your hard earned gratuities for herself each and every week. Your typical shift consists of 2.5 to 3 hours.
There is a lot of favoritism and back stabbing in this department. Everyone is on call, so no benefits and the ones who get most of the work are houseman who work server shifts more so than the servers. The Banquet Managers attitude is shifty, If she gets mad at you, you may not work for months, unless she is very short staffed that day.