Calendar has a mobile app, which allows you the same access as the web app but from a smaller screen!
Tap the top of the screen to access different parts of the app.
If you're an Owner, Approver, or Subscriber, use the dropdowns to see the events with that access. Tap the tags on events you want to see, and then click Apply filters.
The tags shown are applicable to the dates shown on your screen. If you want to see all tags, change the Active tags to All tags.
The agenda will show you only events that apply to the filters you set.