I wouldn't do a quiz as it will restrict the evening too much. In fact I wouldn't really bother with ice breakers. Give out name badges and get people to put tier name and degree title on them, or name and favourite band or something and use that as a starting point. In my humble experience introverts and shy people hate very structured icebreakers and the extroverts and gregarious don't need them. Focus your efforts on introducing people and ensuring you are introducing people with common interests/ backgrounds.