A workflow can have multiple triggers, multiple actions, or both.
Create a trigger for someone being added to the New Visitors group. This will trigger two actions: An email sent to the visitor and an interaction assigned to a pastor to call the visitor. The next trigger in the workflow is an attendance trigger: If an individual attends the Membership Preview group once in a period of one week, the Membership Preview group leader is assigned an interaction to call the individual who attended the class. See A Walkthrough ...