Event Organiser is a free WordPress plugin by Stephen Harris. There is a paid for Pro version with additional features and also premium add-ons.
Event Organiser uses WordPress’ in-built ‘custom post type’, this plug-in allows you to create events that have the same functionality as posts, while adding further features that allow you to manage your events. This includes the possibility of repeating your event according to complex schedules and assign your events to venues.
More info: https://wp-event-organiser.com
