When you select the Google calendar you will see the following message.
(the x’s will be alphanumeric characters)
Cancel / Add”
Click the ‘Add‘ button
You may briefly see a message at the bottom of the screen “Calendar created – fetching events in the background”.
If you now look at the Google calendar main menu (‘hamburger’ icon top left), under ‘Other calendars’, you will see ‘Caltrics’ listed.
How to sync your Google calendar to the calendar on your Android phone
The time lag between selecting additional Caltrics calendars, and the fixtures/events appearing in your Google calendar.