As explained at https://github.com/odoo/odoo/blob/171e42e380a46463b4359166955dc4c5f6ccf42e/addons/google_calendar/models/calendar.py#L206, When there is no Odoo user who is the owner of the updated event, modification are limited to some fields only. In this case, that means we must use the `PATCH` method instead of the `PUT` one to avoid erasing all not modified fields such the event name. opw-2694739 closes odoo/odoo#81341 X-original-commit: 960e63a75350c28f186e55d69bffea6d51dcf7f1 Signed-off-by: Arnaud Joset <arj@odoo.com>