I've toyed with teaching a workshop that entails: teach enough programming to turn a non-flat-file dataset (maybe a json of their tweets) into a decent visualization (by plugging into Google Charts, perhaps) and uploading a static page, with Twitter Bootstrap, onto a free hosting service, or even a blog service such as Wordpress.
But even that is a lot to teach in a day:
1. Command line and file system basics 2. Fundamentals of programming (enough to open a JSON file, parse and aggregate it on some conditions, and spit out HTML) 3. Basic HTML and DOM, including what you need to know to 4. Basic webserver/uploading stuff
Most workshops struggle with getting 3 and 4 done. #2 is not easily achievable over even several days.