It isn't the flashy Material Design upgrade we've been seeing on other Google properties, but Google Calendar on the web is getting a little smarter with a few subtle upgrades. Starting today if you use Google Calendar in a web browser you'll notice real-time updates of information without refreshing the page, meaning you'll never miss a meeting time change or updated details.
The browser back button will now actually function as you'd expect as well. Pressing the back button on your browser when viewing Google Calendar will actually move you back to the previous view in the tab, which had previously been a thorn in the side of Calendar users.
Calendars that you've added to your account under the "other calendars" area are now better organized as well, with the currently selected calendars surfacing to the top of the list. Unselected calendars will drop to the bottom, limiting the amount of scrolling you'll need to do to see additional entries.