I tried adding a groups.io calendar to google calendar by URL.  I retrieved the following URL from the TSC sub-group at lists.opnfv.org: [link removed by mod]

Unfortunately, the events are not appearing on my google calendar.  I tried removing and re-adding the calendar multiple times.  In some cases, I waited one or more days to see if there was some sort of time delay.  Also, note that I have followed this process for multiple calendars in the past, so this is not something new to me.