In the meantime, you could have some cards made up to hand out with the link to your topics
This is an excellent idea. Many years ago, when I used to go to airshows every chance I had I carried business cards with the url of my aviation website. It was so cheap and made it so easy to inform people I came in contact with how to visit the website. I should still do it, for the other occasions to inform someone I meet how to visit the site, like at the coffee shop.