What is the fine-grained topic of the following text: In the audience was the low flutes maker, Katsu Kotato, who was impressed by the piece and performance, and invited Mr. Sheridan to premiere the work in Shiga Japan at the 2011 Japan Flute Convention. Only return the topic.
Katsu Kotato inviting Mr. Sheridan to premiere the work at the 2011 Japan Flute Convention.