How are you intending the students to engage with the material, what learning processes do you want to use and how will you ensure all those attending can fully participate? For instance, you may decide on a horse-shoe arrangement of seats, to ensure that a student with a hearing impairment can see each person speaking.
Students give a presentation in the seminar session which is not assessed but which links directly to a question in the final examination. The case study Linking Student Presentations to Exams shows how it is used in an international trade policy module, but could be adapted for use in any undergraduate economics unit/module.
"Students are divided into groups of 3 to 4. I assign groups randomly each time so that the groups change. Divide the number of students in the class that day by the target group size (3 or 4) and round down. Then count students out to that number, repeating. 1's are in a group, 2's, etc.
Students are given a set of questions to guide their discussion and then turn in a sheet with notes at the end with all of their names. Not all that they discuss will make it onto the write-up sheet, but I have found that turning in notes helps to keep them focused during the discussion."
For more details look at Case Study: Small Group Discussions
"For the purpose of adding structure, I begin each class with an overview of the material to be covered in the class, and where it fits into the course structure. In particular, I outline the key questions that need to be answered. After this introduction, I proceed to work through the problems and discussion questions in turn, making note of associated references that students should consult, identifying the most important passages."
There are more case studies of classroom practice and student engagement on our site.