What is the fine-grained topic of the following text: Registration starts at 8 a.m. Chalkers will begin their work at 9 a.m. and continue until 3 p.m.
"Chalk art is a wonderful and unique form of creativity," said Gus Sako, the event's organizer and owner of the Octopus' Garden novelty store in the Uptown. Only return the topic.
Chalk Art Event Schedule and Organization