It's so great to see a message like this. Thanks for bringing the growing homebrew community in S. Africa to our attention! Though I'm sure there's many people on staff who would be thrilled to come to do a homebrew exhibition with you, the American Homebrewers Association is largely a volunteer-run organization. Our national conference, regional competitions, and especially local homebrewing demos rely heavily on the dedication of our enthusiastic members. That's what makes the AHA such a great community - the enthusiasm for a hobby that we all love!
I think that our upcoming celebration of Big Brew is a perfect opportunity for the homebrewers in your area to join the AHA in starting an event there. https://www.homebrewersassociation.org/aha-events/national-homebrew-day/
Big Brew is always celebrated on the first Saturday in May. This year will be the 22nd year, and we're anticipating over 300 homebrewing demos & events will be organized all over the world to celebrate. We usually have 12- 15 countries besides the USA participate in the celebration. You can register an event on the website, and download some of our promotional materials to help spread the word about yout event.
I hope that this helps! Please feel free to shoot me an email if you have more questions!