AddToCalendar
AddToCalendar — free customizable JavaScript widget "Add to Calendar" for event page. It allows users to easily schedule the event in their calendar.
The widget uses fast (HTTP/2) and secure (SSL A+ grade from SSL Labs) server of https://addtocalendar.com service. By default the widget adds small link to the service on the bottom of event and you can ask support@addtocalendar.com for changes.
Install from NPM
$ npm install addtocalendar
Install from Bower
$ npm install -g bower
$ bower install addtocalendar