The golf module generates a cms site, so you can add the friendly from within the cms site itself.
 
  1. Go to Content > Content Management
  2. Hover over golf website and click manage
  3. Go to Content Management > Site Structure
  4. Click on Folder View
  5. Expand the Home folder and select Home
  6. Go to Advanced Tab and expand Link Options
  7. Click add
  8. Enter the friendly URL and click OK
  9. Mark Publish Immediately and click OK
Note: This will create a friendly url to direct users to the homepage of the Golf site. It will not display a friendly URL under the Properties of the golf event.

To create a domain redirect for the CMS, which will affect the golf site.