Add note to my AutoDiary when I create an event in my Calendar

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

Append to a document

This action will append to a Google document as determined by the file name and folder path you specify. Once a file’s size reaches 2MB a new file will be created.