To create an event navigate to the 'Events' screen from inside the 'Explore' tab, and then tap 'Create' in the top right. This will display the create event screen.
Enter a name for the event you wish to add and then select whether you would like the event to span full days or more a specific time period by toggling the 'All day' selector.
If you have chosen the 'All day' selector you will have the option to just enter a start date and an end date, otherwise you will be required to enter a start time and end time in addition.
Once you have finished entering these details tap 'Done' in the top right to complete the process.
The event will now show up in the 'Events' screen for you to browse.