This should be useful: after an update yesterday, Amazon's Alexa can now be used to add events to Google Calendar by voice. You can either prompt Alexa by saying, "Add an event to my calendar," or you can be a bit more natural and specific, saying something like, "Add family brunch to my calendar for Sunday at 10AM."
Alexa could only read back your calendar before now
Alexa has had Google Calendar integration for about a year now, but it's only been able to check your calendar and read it back to you up until this point. That was helpful, but being able to just shout things at Alexa when they come into your mind is sort of the best thing about it — and this should make managing your calendar way less of a hassle.
Of course, you'll still need one of the few devices that include Alexa to get started. Those include the Amazon Echo, the Echo Dot, the Amazon Tap, and the Fire TV.