Installation 

Install the extension with Composer:

Install the extension
composer require mediaessenz/fullcalendar
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Events of EXT:calendarize are optional. To use them, install it as well:

Install EXT:calendarize (optional)
composer require lochmueller/calendarize
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Then include the extension into your site, with one of these two ways.

Site sets way (recommended) 

Add the Site Set Fullcalendar (mediaessenz/fullcalendar) to the dependencies of your site, either in the backend module Sites > Setup or directly in your config/sites/<identifier>/config.yaml:

config/sites/main/config.yaml
dependencies:
  - mediaessenz/fullcalendar
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If you use a site package with its own Site Set, add the dependency to the config.yaml of your set instead.

The set provides the TypoScript of the plugin, the page type for the calendarize feed and the settings of the calendar, which can be changed in the site settings editor.

Classic way 

Open your TypoScript template record, switch to Includes and add the static template Fullcalendar (fullcalendar). The default values can be changed with the TypoScript constants.