What ceremony is the speaker addressing? The______ceremony of the International

Dear judges, guests, teachers and students!
    (16)It is my great honor to attend this prize presentation ceremony of the International Arts Contest. I’m happy to share the joy and achievements of the event with all of you.(17)This contest provides young people with a good opportunity to develop and express their creativity. It also enables the public to appreciate different cultures. Since 2010,(18)the number of participating countries and regions has increased from 25 to 41.(19)This year, the theme is Our Mother Earth. It is very encouraging that(20)over 5,000 pieces of photographic works have been submitted through the online system from overseas. I would like to take this opportunity to welcome our guests and prize winners from different parts of the world. Thank you very much.