Here's an example of how you might create a course overview presentation and then use screencasting software to record and post the presentation with a voiceover to YouTube. If you link your teacher site or blog to these products, your parents/guardians who cannot attend or who miss part of your presentation for any reason will be able to review what they've missed. These techniques have many additional useful applications, and if you're interested in how to use the tools or implement the results, please let me know (or for BMS Staff, stop by Friday for some training!)
Here's a link to the Prezi with active links to additional resources: http://prezi.com/bdrivanqwakk/open-house-2013/
…and to the YouTube recording: http://youtu.be/xPuwQ6AcjTU