OS X Yosemite :: Why Won't Contacts Phone Number Appear In New Event Added In Calendar

I'm new to using the Apple Calendar to list new events added. Previously, I used Microsoft Outlook 2010 for my business needs on my old PC and that worked perfectly for adding new jobs. Recently I made the change to a 27" iMac running Yosemite (which I love) and I purchased MS Office 365 for all of my business templates and approximately 1,000 customers. The MS Outlook program is having a lot of trouble syncing to the Apple Calendar which wasn't a problem on my old PC.

So, I thought that I could just use the suite of programs included with my new iMac instead of Outlook. Unfortunately, when adding a new event and add a customer as a location, it will only list their address and not their phone number which is something that I must have. I understand that I will have the contacts listed with me always, but I don't want to have to switch between programs to pull up the listed contacts #. If this is not available then I fear that I will have to revert back to MS Outlook and just figure out what is preventing it from properly syncing with Calendar. I use the Calendar app on both my iPhone 5 and my iPad Air religiously so in the end it all comes back to Calendar.

Info:
iMac (27-inch, Late 2013), OS X Yosemite (10.10.1)