How many times have you reflected on your speech or big presentation and recognised appropriate words and persuasive ways that helped you pass your message across? I am sure quite a few times since it has some kind of pride attached to it.
I am sure you have thought about this over and over again and told yourself that next time you will prepare similar ways for persuading people. However, a relevant discussion may happen all of a sudden, thus, failing to impress and getting people your way.
When you know that you will soon be presenting to a big audience, you will most certainly prepare a polished speech, make notes and use really specific and contextual words. However, you may also talk to people and try to convince them during conference break-outs, business breakfasts, and even parties. In other words, if you wish to get your point of view across to others, you would need to influence anytime and anywhere.