At the American Economic Association, there's no swag. I go to (a) leaf through new books and buy them at the conference discount, (b) meet scholars doing the same, and (c) chat with editors about books in progress or idea by me or others.
Just thinking of how helpful my seminar yesterday was for getting me going. That's a use of seminars and conferences even if you get no good comments (but we did!). https://www.rasmusen.org/rasmapedia/index.php?title=Ostracism_in_Japan A reason to go to a conference even if you know your audience will be just 5 people.