All registered kindergartens, primary schools, secondary schools, post-secondary institutions, universities, charitable and non-profit-making organizations with a group of 20 or more; and all registered special schools, non-profit-making organizations of services for the elderly, rehabilitation services and people with disabilities with a group of 10 or more are welcome to apply in writing for waiver of the admission charges. Such application should be made at least 2 weeks before the proposed date of visit.