When it comes to digging for the answer to a specific question (did toothbrushes exist in 1857?) I start with Wikipedia. A Google search is often helpful. And you can find online photos and art of your period with clues to fashion, architecture, and geography.
That is to say, SC authors in the Columbia area with books to sell won’t find a friendly face at a local bookstore. If you’re already successful, i.e., a name-brand author, our libraries occasionally sponsor guest appearances. They’ve also organized book clubs, but I don’t know of any author who’s been invited to appear at one.
To inquire about placing an ad on her show, get in touch with her through her blog.