Moonlight Summer Concerts - 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: Duration varies depending on your chosen experience.Group Size: This experience is for two people there will be other people there on the day.Weather Dependent: NoThe minimum age for this experience is 18 years old.Availability: This experience is available selected dates of the year subject to availability.