This is the Calendar
If
Any event starts
This Trigger fires a set number of minutes before the starting time of any event on your Google Calendar. Note: The time in the ingredient will be based on the timezone set in Google Calendar.
Then
Upload file from URL
This action will download a file at a given URL and add it to Google Drive at the path you specify. NOTE: 100 MB file size limit.
Explore more great ways to automate Google Drive and Google Calendar