Starting from iOS 12 update, the system allows Siri to suggest you Shortcuts for the things you do on your device to perform them faster, and Calendars supports this as well.
Use a simple Siri command to access your schedule within seconds.
To use Siri Shortcuts, update your device to iOS 12 (iPhone 5S and newer, iPad mini 2 and newer) and to the latest Calendars version. If it hasn't automatically, go to the App Store > Updates, find Calendars, and tap Update.
Shortcuts can be created in the Shortcuts app.