I hope it's okay to tail onto this thread. I'm new to your site and to Drupal. I've enjoyed the video/lessons.
Personally, this Part 4, Session 8 had me stumped, for awhile. I think it's a little soon to have someone add a module with no real instruction or more detail for the configuration of the module, beforehand.
Anyway, I managed to get it installed, but still had no idea which items in the modules listings to enable. There are many in the "Date" section. I enabled the ones I thought I needed by watching the Lullabot free video and trial and error. Good thing you talked about deleting content and content types in the Session 7.
Here are some hints to others who may run into these same issues:
Once you figure out how to install the module, you need to go to modules and enable and configure certain elements:
Date - enable
Date API - enable
Date Popups - enable and may need select the jquery timepicker in Configure.
Date Tools - enable and configure using the Date Wizard link within Configure.
The sample Field settings screen shown in Session 8 is the screen you see when configure options and advanced options of the Date wizard. (not the field settings when configuring the content type as accustomed to seeing in previous sessions) This wizard creates a Date content type and fields you can use when creating other content types, namely a Festivals content type.
Hope this helps other beginners.