Missing the days of school? Here are some places that you can continue your education:
Coursera offers a Designing Cities course taught by professors from University of Pennsylvania. It's extremely well done. A little beginner but still enlightening.
If you haven't checked out Coursera there are plenty more courses to take that apply to urban planning and are all free! (Model Thinking, Introduction to Sustainability, Design: Creation of Artifacts in Society, Making Better Group Desicions)
Planetizen also offers courses, they aren't free but seem affordable.
ESRI is holding an event Sharpen Your GIS Skills Seminar, November 5, 8:00 AM- 12:00 PM, free!
City of Chicago Colleges also offers classes that could be interesting. Here is an Architectural CAD class.
Youtube is also a great place to look first before paying for courses, here is a tutorial for Google SketchUp.
Have fun!