You cannot use a microflow to do such task. Instead, you can use this plugin
https://www.npmjs.com/package/cordova-plugin-calendar
which enables you to find a specific event within the iOS calendar. To do this, you can create a custom widget to make use of the plugin (have a look on the app store if it already exist, if not you can always create your own using a boilerplate), and deploy a phonegap app for your application.