Hidden fields are a great way to record information that is only used for administration purposes. One way this can be used is to assign a campaign ID to your record.
To use this follow the steps below:
1. Add a new text question to your form select more options and add a default answer.
2. Select more options and add a default answer.
3. Enter the event Campaign ID or code as a default answer. Do not tick the example answer box.
4. Select "Keep this field hidden from view in the form".
Once your hidden question is set up this ID will be included with every registration when you export, alternatively if you have an integration to your CRM you can find out more about mapping this field here.