You can add any publicly-available 25Live calendar to your Google Calendars list, as long as the 25Live calendar is published without password protection.
Note After the 25Live calendar is updated, it can take up to a few hours for the changes to appear on your Google Calendar.
In Google Calendar, you have the option to add a publicly-available 25Live (or any .ics) calender to the Google Calendars list.
The URL should look like "webcal://the_calendar_URL.ics" -- where "webcal" replaces "http" and ".ics" is added to the end.
For a fictional 25Live University calendar, for example, the URL might look like: "webcal://www.trumba.com/calendars/trumba-u.ics" in Google Calendar.
Tip For more information, go to Add someone else's Google calendar in Google Calendar Help.