In order not to miss any appointments, such as birthdays, we can activate alarm or notification reminders for calendar appointments on the Xiaomi smartphone. This can be individually set to remind us with sound and vibration, and the ring tone can also be set.

Android 10 (MIUI 12.0)
Step 1:  Open the  Calendar app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Reminders
Step 5:  Enable  Notification reminders
Step 6:  Set  vibration  and  sound
  1. Open the Calendar app
  2. Open the menu
  3. Open the Settings
  4. Tap on Reminders
  5. Enable Notification reminders
  6. Set vibration and sound

Xiaomi Instructions