What about some younger bizzes? They may be enthusiastic at the opportunity to show off new offerings and pick up a little extra exposure. We have a few BPL-frequenting gear sellers including, John West/Borah Bivy, Tim Marshall from Enlightened Equipment, Lawson Kline/Mountain fitter,and Jhaura from Litetrail. I know there are more but this comes to mind at the moment.
I also think some UL/SUL bloggers like John Abela or Stick could help provide coverage in a write up after the GGG. I know it would obviously be the preachers and the choir so no new exposure, but faces and names are always a pleasure to put together, and I would be more likely to subscribe to a blog or YouTube channel after meeting someone. In person.