How do I best combine two Outlook calendars into one?

All:

I'm using a MacBook Air now upgraded to OS X Mavericks and an iPhone 5 running iOS 7.

I have Outlook for Mac -- pulling mail from two Gmail accounts -- and a calendar and contacts archive created from my former Exchange account from work.

Right now, Outlook is showing items from two calendars -- the Calendar and an "On My Computer" Calendar pulling from the archive version. Neither of them shows up my iPhone. Previously, the Exchange calendar was the only one I showed on the iPhone. I no longer have an Exchange account.

Ideally, I would would like to start fresh with just one calendar visible on both MacBook and iPhone.

I'm open to any and all suggestions about the most seamless approach.

Thanks!