The Switchboard Chrome extension makes it easier to add room links to meeting invites right from Google Calendar.
After you install the extension, you'll see an "Add Switchboard room" button when creating invites.
Click on it to select the Room link you would like to add to your invite. 
How to install
Click here to go to the extension page in the Chrome web store. Then click "Add to Chrome" to install it in your browser.
Once installed you should see the extension icon in the top right of your browser
