When you create a new Google Calendar event on a specified Google Calendar, IFTTT will add it to a Google Sheets spreadsheet and then send you a notification from the IFTTT app with information that the event was added into a spreadsheet.

If

New event added

This Trigger fires every time a new event is added to your Google Calendar. Note: The time in the ingredient will be based on the timezone set in Google Calendar.

Then

Add row to spreadsheet

This action will add a single row to the bottom of the first worksheet of a spreadsheet you specify. Note: a new spreadsheet is created after 2000 rows.