Add events calender

https://wordpress.org/plugins/the-events-calendar/installation/

Install & Activate
Installing the plugin is easy. Just follow these steps:

From the dashboard of your site, navigate to Plugins –> Add New.
Select the Upload option and hit “Choose File.”
When the popup appears select the the-events-calendar-x.x.zip file from your desktop. (The ‘x.x’ will change depending on the current version number).
Follow the on-screen instructions and wait as the upload completes.
When it’s finished, activate the plugin via the prompt. A message will show confirming activation was successful. A link to access the calendar directly on the frontend will be presented here as well.
That’s it! Just configure your settings as you see fit, and you’re on your way to creating events in style. Now that you’re all set up and ready to go, how about checking out the new user primer to familiarize yourself with what’s in store?

 

To add it into your Menu – go to your customised menu and under links add the permalink to your Calender and give it a name – this way it will go to your calender when you click on the tab