Answer: Non-rival and excludable.
Explanation:
According to the good criteria , excludable goods are those items that can be prevented or restricted from getting used by consumer without payment. The person who has not paid for service or good cannot access it.
Non-rival good are considered as the product or service that can be consumed public .Any person has the consume and access it.
According to the question, blue music festival can be characterized by non -rival and excludable good because public(every person) has the access to the concert but for entry to the concert will be permitted only to those people who buy the wristband and otherwise they will be restricted to enter.