Simple Calendar Blog Feed is a Simple Calendar add-on that lets you use the WordPress blog posts as if they were events.
After you have installed and activated the add-on, proceed to create a new calendar by clicking Add new under Calendars menu item in the WordPress admin dashboard.
From here, choose Blog Feed as Events source and click on the corresponding tab in the calendar settings panel below.
You have two options to select which posts to show: you can either show all, or select only posts from certain categories you can add below.
Apart from this setting, you can use the other settings as you would do with other calendars.
This special calendar can be blended with other calendars using the Grouped Calendar events source (create yet another calendar using this events source or edit an existing one and add the Blog Feed calendar you just created to the group).