If you speak on an event, you should have personally witnessed it so you have credibility.

Question

Quizplus · Accepted Answer

While it is true that personal experience can add credibility to a speaker's account of an event, it is not always necessary. There are many situations where a person may have researched the event or spoken with people who were present, allowing them to speak on the topic with expertise even if they were not physically there themselves.

If You Speak on an Event, You Should Have Personally