f I create an Event for a Google+ Hangout, is there a way to send an affiliate to the Event Page where they can get credit for a sale?

Sorry I just now seen this, but yes. There are 2 different ways I have done this.

1. The affiliate sets up a stealth redirect. That is where you set the original link to be his affiliate link and then have it redirect to the Google hangout and still dropping the affiliate cookie.

2. Submit your product to an affiliate program like DigiResults and set your sales page url as the Google hangout page. So the affiliate link will still be tracked if you use a buy button from whatever affiliate program you use.