The  goal is to get a SMS notification when a event like birthday comes. The google calender sms notification is almost free. I have set my necessary event on my google calender and receiving notification.


Procedure:
1. Sign in to your Google Calendar
2. Click on Gear button > select Settings (like image)








3. Click on Mobile Setup > select your Country > input your Phone number > click on Send Verification Code (like image)




4. Enter the code you received via SMS in the Verification Code field > click Finish setup
5. It will take you to Reminders and Notifications tab. Now select SMS option then click on Save button (like image).



 

Feature:  
Beside this you can know others by sms command. To receive a notification with your calendar information, send a text message containing one of the following commands to the shortcode 48368:
  • NEXT – Request your next scheduled event
  • DAY – Request all your scheduled events for the present day
  • NDAY – Request your events scheduled for the following day
  • STOP – Opt out of receiving SMS messsages from Google Calendar on your phone