StrongTowns.org has a post that really works for the start of a new semester of planning.
Written by Nolan Gray, the post explains how Lexington (the best little city in America) could address its affordable housing shortage without compromising the city's famous urban growth boundary. So for a first day lesson, it already integrates the UGB and an important social and economic issue.
The article goes on to talk about mixed use, setbacks, parking, and little zoning tweaks that could make a big difference. For a first day conversation, it is a useful piece because it shows how planning often uses indirect levers to manipulate a problem. It also serves as a reminder that there is a lot to learn from informal sources, like non-profit blogs. Plus, Lexington is a great city that you should read about more often.