When a visitor to your event's page registers for the event, a Campaign Member record is created for the Campaign related to the event you've linked within Soapbox Engage's Events app. Since organizations might have different ways to define the status of these Campaign Members, the Events app does not apply any particular Campaign Members status value. Instead, following standard Salesforce conventions, the new Campaign Member is given the Responded status value.
This is great news for Salesforce administrators, as it provides you the control you need to customize whatever you'd like to set as the default Campaign Member status for every Campaign you create. To do this, follow these steps:
Salesforce Classic
After you create your Campaign in Salesforce, just click on the Advanced Setup button on the Salesforce Campaign page in question. Then, after clicking the Edit button, simply choose or create the proper status value you'd like to have selected and click the proper Responded checkbox as you see fit.
Salesforce Lightning
First, make sure that the Campaign Member Statuses related list is added to the appropriate page layouts. After you create your Campaign in Salesforce, navigate to the Campaign Member Status related list and click the "new" button to add a new status or update the default status.
Happy event management!