There are 4 calendars shown below...S.U.G. calendars are directly from Sign Up Genius, and the other two are independent calendars for the Warehouse and the Teacher Resource Store. Click the drop down arrow next to AGENDA to un-check calendars you do not want to see! 

Once you have the calendars you want selected you can click the +Google Calendar to subscribe to these calendars, this does require a personal or storehouse gmail account.  Clicking on an event will open more details about that event such as a TRS Shopping trip coming from Sign-up Genius would show you who has signed up to shop for that date.