A classic seminar would be restricted to a small group of people (perhaps 10-15) and would meet for a long session once a week. The classes would consist of discussing the previous week’s reading assignments (which = long articles or even an entire book, given that you have a full week to complete it). Everyone is expected to participate actively and the instructor, if it’s a good seminar, doesn’t say very much. Each student then writes a long paper about a subject related to the reading material. Often, the last couple classes are devoted to student presentations about their papers. This is also how most graduate school courses work, so it serves partly to prepare you for that.

Good luck