That calendar has some correct entries, but mostly they're no longer accurate.
I've emailed w3c.ccg@gmail.com multiple times, and the messages haven't bounced (to me), so I think that Google account still exists, and I'm hopeful someone either has the relevant credentials or can recover the account from Google.
w3c.ccg@gmail.com owns https://calendar.google.com/calendar/u/0/embed?src=6a4bq17no84ssnadccm0j2133g@group.calendar.google.com&ctz=America/New_York
That calendar has some correct entries, but mostly they're no longer accurate.
I've emailed w3c.ccg@gmail.com multiple times, and the messages haven't bounced (to me), so I think that Google account still exists, and I'm hopeful someone either has the relevant credentials or can recover the account from Google.
This underlies https://github.com/w3c-ccg/traceability-interop/issues/636 among others.
Please help!