What is the fine-grained topic of the following text: During the first observance of WDSD, then Secretary-General of the United Nations Ban Ki-moon had said, "On this day, let us reaffirm that persons with Down syndrome are entitled to the full and effective enjoyment of all human rights and fundamental freedoms. Only return the topic.
First observance of World Down Syndrome Day (WDSD) by United Nations Secretary-General Ban Ki-moon