When the registrations are closed, you would like to turn off the notification function and stop receiving emails for new entries. This step by step tutorial explains how you can disable or temporarily turn off email notifications in Google Forms.
Step 1: Open the Google Form, go to the Addons menu and choose Email Notifications.
Step 2: Choose the Forms Troubleshooting menu.
Step 3: Click Disable Notifications and you’ll get an onscreen message confirming that the notifications have been turned off for that Google Form.
If you would you like to resume/restart email notifications for the Google Form at a later point of time, choose the restart option available on the same screen.