We have three levels and two categories. There are some class examples that we have taught before.
Everyday English conversation
Business case study
Students are working people, so business classes are very popular. In fact, business related courses have the best sold out rate in MDT. For example, Chris' class Resumes, Self Intros, and Cover Letters (link) sold out almost every time.
Most students want to talk about topics that are relevant to everyday life, based on news stories and/or interesting short videos.