Adding an event whether birthday, anniversary, holidays to Google Calendar will make the moment remember and will help you not forget. Adding birthdays to Google Calendar is like adding any other event.
If you set up birthdays in Google Contacts, those birthdays dates are added to Google Calendar automatically when you sync Google Calendar with Google Contacts. This way, every birthday you enter in Google Contacts shows up as an event in Google Calendar.
Enable the events in Google Calendar
1. To enable the Birthdays calendar in Google Calendar:
Open Google Calendar.
2. Now add the date to the calendar by clicking on the date, add a title to the event. Click on more options to edit event.
3. Choose all day to notify the event all day. Choose repeat annually from the dropdown list. Add notification, description to the event.
Unlike other calendars, the Birthday calendar cannot be set up to send notifications. If you want birthday reminders in Google Calendar, copy the individual birthdays to the personal calendar, then configure notifications as needed.