I am a teacher of Chinese as a foreign language, and many of my students are adults. In the teaching, how to apply the traditional culture and other ways to cultivate the interest of Chinese learners?
One of the best methods is to go with students to diverse shops -- restaurants, malls, markets -- and invited them to ask everything in Chinese. If you are not in China or you don't have a nearby "Chinese town", you can try to do it using videoclips help.
You can talk about Chinese festivals, food for example.
Once you are teaching adults, it would be specially convenient to introduce some social and cultural aspects (etiquette rules, superstitions, habits, business etiquette, meals, gifts, colors, etc.) and approach them in a comparative and intercultural way. It would be interesting and also very useful for their future interactions in China and/or with Chinese citizens. And the world is in a big need of intercultural competences, as well.