In Salesforce, create a Campaign. Also, create Campaign Member Statuses for the values: Registered, Attended, Did not show, Withdrawn. (if you can't see Campaigns in Salesforce, contact Salesforce Admin to enable Marketing User license)
Copy the Campaign ID, and set as the default value for this field, Campaign ID, below:
- Click on the field
- In the pop up menu, find the blue "Options" button
- The Field Properties menu on the left will appear - scroll down to "Default Value" and replace the Campaign ID placeholder with the ID you just created.
Submissions will create Lead records and Campaign Member records attached to this specific campaign.