Pronamic Events is a basic plugin to add some Events functionality.
This plugin uses custom post types to add some Events functionality. Pronamic Events allows you to add, edit and remove events.
With Gravity Forms and the Gravity Forms + Custom Post Types you can create an form to create event posts. In most cases you also want to automatic fill in the event start date, end date and location. You can set this up by checking one of the options on the date/time fields.
For the other fields you can add Custom Fields from the Post Fields section and give them the correct custom field names: