He claimed to have been snatched for trying to send a postcard to the wife of late Nobel laureate Liu Xiaobo.
The widening scandal involves eggs contaminated with the insecticide fipronil.
But the government is not giving any explanation for why the school is being shut down.
The court disqualified the four for deviating from the standard oath of office when they were sworn in late last year.
Customs officials seized 7.2 tons of ivory hidden under loads of frozen fish.
Wong and other activists had been calling for true democracy for the city when they were detained.
Xi arrived Thursday to celebrate the 20th anniversary of the city's handover, but not everyone's happy to see him.
The per capita GDP of Beijing soared 40.2 percent from 82,000 yuan (US$12,065) in 2011 to 115,000 yuan (US$16,920) in 2016, according to official data released by the local statistics bureau on Monday.
Red-whiskered bulbuls start chirping around 5 a.m. at Wonderland Villas, a hilltop complex in leafy northern Hong Kong whose own history charts the city's political, economic and social fortunes.
Hong Kong's Victoria Harbour is one of the world's busiest ports, but every morning daring elderly swimmers dive in to its choppy waters against a teeming backdrop of ferries, cargo ships and fishing boats.