I have a Customer who has signed up for an event and want to send an Email 2 days before the event happens. The event data is in the Journey Data. However when I come to make a Wait Activity, I can only choose attributes from Contact Data. Since there's a 1:N relationship between Contact and Event Attendance I can't use the Event date from that relationship. If there are multiple events it will chose the wrong one.
How do I access the attributes from the Data Extension that starts the Journey from a Wait Activity?