The arrest sparked angry public rallies which later turned violent in parts of six northern districts.
The annual travel rush or chunyun around the festival often puts the transport system to the test.
The appeals were made in response to a campaign to boycott classes scheduled to begin Monday, the first day of the new semester. The organizers hope to rally students to take the protest against the now-shelved extradition bill beyond summer vacation.
The age of criminal responsibility in China is expected to be lowered to 12 in some special situations in accordance with a draft amendment to the Criminal Law in a move to better respond to serious violent offenses by younger people.
The annual tech show, which runs from Tuesday to Friday, has drawn more than 4,500 exhibitors from over 160 countries.
The airport, which is planned to open before Sept 30, will act as a second international airport for Beijing to relieve pressure from rising demand for air travel on Beijing's Capital International Airport.
宁德包皮手术需要什么检查
The anti-graft authority in Beijing said that Liu's arrest proved again that overseas was no paradise for fugitives and giving themselves up was the only way to go.
The ancient walled city of Pingyao in Shanxi province has become a magnet for tourists. Cao Yang/Xinhua
The amendment said food delivery platforms need to be legally responsible for courier compliance with traffic rules or face a fine of up to 50,000 yuan.
The aircraft, with 22 Chinese passengers onboard, flew from Hong Kong to Cape Town International Airport, and then flew to Antarctica. Next, the team will fly around five to six hours to the South Pole, and it will become the first self-organized Chinese scientific research team.