The conference staff in the conference center are mainly responsible for preparation, tea, conference supplies, etc. Before the meeting, you should also be responsible for keeping the conference room and server clean and tidy. Basically, they can do it after training.
The housekeeper is mainly responsible for the reception service of the meeting. It's not easy to cooperate with the conference organizers to do the venue layout and all kinds of preparatory work in the early stage. It's more demanding than waiters and requires higher ability, so it's not easy to cultivate, so the housekeeper is relatively stable.