play.google.com
Calendar Notifications is an app store page with install details, screenshots, reviews, and app information.
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episodecalendar.com
Episode Calendar is a website for tracking TV shows in a personal calendar, checking off watched episodes, and receiving email notifications when shows air. It offers daily or weekly notifications and RSS feeds, with a mobile web version rather than native apps. The FAQ states that premium accounts exist to support the site.
tuta.com
Tuta Calendar is an encrypted calendar that organizes events with end-to-end encryption and a zero-knowledge architecture. It offers push notifications, two-factor authentication, and sharing of calendars and events. Apps are available for Android, iPhone, and open source desktop clients for Windows, macOS and Linux. It is also integrated with email.