The latest update to the Google Calendar app for Android brings a lot of new features. You can see more events with the new 7-day week view and pinch-to-zoom, add Google Drive files to events, hide Google+ birthdays from the settings, show week numbers and import .ics files from other apps. The new version is gradually rolling out over the next few days.
The feature that lets you hide Google+ birthdays will also be added to the web interface next week. All the other features are already available in the desktop site.