What is the fine-grained topic of the following text: Since 2005, he has participated in world-renowned clown festivals, such as Edinburgh International Festival, Ansan Street Arts Festival and Chuncheon International Mime Festival in Korea, Danish Clown Mime Festival, and Yi-lan International Children’s Folklore & Folkgame Festival in Taiwan; Huang is indeed a skillful performer with tremendous international performance experience. Only return the topic.
Huang's participation in international clown and mime festivals