Small Simple Calendar

Completely free without ads!
Smart dual view with calendar and list at the same time.
Super fast entering of new events, just tap a few buttons for hour, minute and title, or type the whole event, like "mon 11 dentist" (or just "mo11dentist")
Resizable (text scaling) home screen widget with agenda view.
Fast even on slower phones, battery and memory friendly.

Uses your system calendars (you can use Google web-calendar to add and share calendars that sync to your phone).

Localization:
Uses your country's first day of week, date order, time format and weekday/month names.
Add a holiday calendar from Google and select colors for the different holidays in this app.

Fast search: just type ".hello" to show all events with "hello" in title. You can also copy search results.

The keyboard pops up automatically and you can leave it on screen when navigating the calendar.

Dark and bright theme

Switching time zones does NOT change all your event times as in many other calendars.

The app is aimed at fast, easy personal usage. You can not enter participants, description, location, todo-list or send invitations from it.
It doesn't create notifications by itself, your pre-installed calendar app should do that even if you don't use it.
Not supporting right to left writing or other calendar systems (just Gregorian calendar).