Four people were arrested for money laundering over suspicions the funds were used for personal gain, among other things.
Instead, the boy was placed under a two-year care or protection order and must follow a curfew.
Demonstrators said they are concerned about police violence and the loss of personal freedom.
The event is set to be replaced by a much smaller show taking place from the city's rooftops.
22-year-old Sun Shuwei says he wants to exercise his rights to freedom of expression to defend the police and Communist party.
President Xi Jinping and Premier Li Keqiang both reiterated their support for the Chief Executive, but said the city's government has more work to do.
Mansanori Nishikawa has been in the city for one week to "make people happy and smile" amid the ongoing clashes.
Students in the Yau Tsim Mong and Sham Shui Po districts gather in Tsim Sha Tsui to chant slogans and sing protest songs.
International education consultancy says inquiries about studying abroad have increased by more than 10 per cent since protests broke out in June
Remember when you didn't assume people wearing masks were heading to protest?