To deactivate Auditing events on a Site Collection, please do the following:
Click Reporting from the Sharegate menu.
Select New Report.
Select Site Collection as your object type.
In Filters, select Audited events Is, and select the relevant events.
Click Continue without Saving.
Select the Target (it will be the site collection you wish to revoke the auditing events for).
You will now see the Results page.
Select the Site Collection and click Edit Selected item(s).
Specify Remove Audit Event as a Transformation, and select the relevant events.
You will now see your Results page.
Auditing events will now be disabled for your site collection.