Gnome developer Erick Pérez has given us a glimpse of how Gnome Calendar is shaping up. Though still its in skeleton stage, you will get an idea of how it will look like in future version of Gnome.
As Erick admits, "Calendar is moving forward, slower than I would like, but is moving."
Here is the event view currently implemented. The widgets are almost done, though some retouch needs to be taken in notifications and some artwork left for event remainders.
Also, if you would like to view an event, you will get the detailed descriptions and other parameters in a window like this:
You can also edit events in the above window.
All this setup seems optimized for touch devices. How it will fare for desktop users using the mouse is still a question.