Add web calendars to Vivaldi Calendar to view publicly shared events and schedules.
Change the visible hours in Vivaldi Calendar to match your average day length.
Stay organized by adding tasks to the Calendar.
Create a new event from highlighted text on a web page or in a Mail message.
Choose how much information you want to see about events in Calendar by choosing either the full, compact or minimal view.
Keep the event editor inline with other events or have it pop out in a dialog. The choice is yours.
Use single key shortcuts to switch between Calendar views.
Enable Mail, Calendar and Feeds from Settings > General > Productivity Features.