Pass status indicates whether or not you have purchased a pass for that particular VR concert. You can purchase a concert pass from the Hub.
Here's a detailed explanation of each pass status:
Purchase Needed: A pass for this concert has not been purchased. You can purchase a pass from the Hub.
Purchased: A pass for this concert has been purchased and is currently active.
Complimentary: This concert is provided for free. A purchase is not necessary.