Outdoor Proms Concert for Two - Key InfoVoucher Validation Your voucher is valid until 01 Jul 20 You must validate book and use your voucher within the voucher expiry date.Duration: Your experience will last for all evening car park opens at 2pm gates open at approximately 4pm.Group Size: There will be anywhere between 5000 to 10000 people attending the concert.Weather Dependent: NoSpectators: You're welcome to bring friends and family on the day however they will need to pay for their entrance.Restrictions and Considerations: There are no fitness requirements for this experience.Children under 16 years old must be accompanied by an adult.Availability: Selected dates are available between July and August.