Google Calendar no longer supports https URLs. A workaround is to convert the https URL, found within Blueprint, to a regular http URL, as shown in step 1 below.
First, add the subscription to your Google Calendar account:
Go to https://bitly.com and convert the iCal URL. You can find more information on the iCal URL here.
Log into your Gmail account, and access your Google calendar.
In Google Calendar, click the drop-down menu next to Other Calendars, and click Add by URL.
Enter the converted URL from step 1 above.
Click Add Calendar.
Google will begin to synchronize the calendar, and it will appear on the screen.
Optionally, click the drop-down menu next to the calendar listed under Other Calendars, and click Calendar Settings.
Change the Calendar Name (e.g. Steven McDonald), and click Save.
Second, verify that the new calendar is synchronized to your device:
Open the Calendar app on your phone/tablet.
Click the menu button, click Calendars to display, and do one of the following:
Click Calendars to sync, check the box next to the newly added calendar, and click Ok.
Click Calendars, click Display, check the box next to the newly added calendar, and click Done.