Topics covered included: developing characters, dialogue, action, scene setting, plotting, literary agents, query letters, and publishing. I may have missed one or two but those are some of the main items most books and articles on writing cover in some format or other. In the workshops I attended, the organizer brought in professionals like a published author or literary agent to speak about their craft and/or work. One speaker was a successful self-published author from across the continent who attended via video. Seated around the table in the public library conference room, we were able to see him, hear his speech and ask questions, which he answered.
In another workshop we wrote very short stories and read them aloud to the class for feedback. I forget what the lesson of that class was. All of these workshops occurred in one-evening segments over the course of several years but could conceivable occur in one weekend seminar/workshop.