Talks are a way of communicating with a lot of people, but only in one direction. What I'm trying to say with this, is that when a lot of people discuss one topic, it can make sense to just present that topic in a more open way (Im referring to talks here). This means, that the talks I have held in the past have mostly started with me having the same discussion with a lot of people or I've shown a lot of people the same stuff and thought "I should do this for everyone in the room".