1.I think that students should be exposed to all kinds of people from all walks of life.Therefore,it doesn't really matter if one doesn't have enough "knowledge" of social status.As long as this person can inspire students and pass on what they know which can benefit students,this person should visit the schools.
2.These visiting speakers should be able to recognize their audience and they should be able to present a good and clear speech to the audience.They should be more knowledgeable than the audience in certain ways.
3.This person should be clear in their speeches and they should be inspirational and interesting in their speeches.They should also be able to present their point accurately across to the audience.
4.It is definitely useful to use powerpoint presentations as an aid to help present the speakers' points across.It will make the presentations more interesting and give illustrations to the audience.Also,it is essential when the speakers are presenting graphics.