I think that the team has not only developers, but also those who promote the project. At conferences, it will help people to know about the project. I attended some conferences about blokchkane and there I learned about many new projects.
Advertisers are professionals in their field, but they cannot answer specific technical questions. Plus, the full completeness of the decisions belongs to the project team, only it can make decisions about the ways of its development.
I also think that the offline events should be visited by the team personally, but not by its representatives.