Comrades Niantic! When will the dates of all Ingress events be known? When will you publish a full calendar with all Ingress events on the site? People are asking! They need to plan trips, combine with vacation!
only 1 anomaly so far, maybe thats all there will be first half 2020...
What is currently known can be found in this post: 2020 Event Update.
That said, it looks like both https://ingress.com/events/ and https://nianticlabs.com/events/ need some updates.