Games for a particular sport are not appearing on any calendar.

If you are not seeing the games from a particular sport appearing on the upcoming or composite calendar, you'll want to check a simple setting inside that particular schedule. 

Edit the schedule, click on the Information tab and then scroll to the bottom. Here, you will want to make sure that the Visibility field is set correctly. You can choose from "Visibile" which shows everyone, "Schedule only" which excludes the calendar everywhere except the specific schedule URL or "Hidden" which hides the entire schedule everywhere on the site.