部门聚会
department party
A: Salas,could you arrange a department party on Friday evening?
B: No problem.I will order tables and meals.
A: Do not forget to give me the list of our guests.
B: Ok.It'll be ready soon.

生日聚会
birthday party
A: Today is Tom's birthday,could we have a party in our department?
B: Yes,we could.We're planning to have a birthday party for everyone in our department.

欢迎会
welcome party
A: Mr.Smith will come to our department to instruct us in the experiment.
B: Let's hold a party to welcome him.