Events behave very similarly to standard posts. To create a event, select the ‘Add New’ submenu from ‘Events’ menu. The chief difference between events and post is the ‘Event Details’ metabox which sets the date and venue data related to the event.

You can also add events in the Calendar view in a manner similiar to Google Calendar. By selecting one (or multiple) days (in month mode) or times (in week/day mode) you can create an event that spans the selected period.

The Event Pages Don’t Look Right

Unfortunately its impossible for the default templates to work with every theme. Occasionally, they simply don’t work well with a given theme – the event content might not appear right, or the sidebar might seem displaced. The solution is to edit the default templates to fit in with your theme (you can use your theme’s own templates as a guideline). You can find more information here