Disqualified candidates included activist Joshua Wong, some members of the Civic Party and others who won an unofficial primary vote held by the opposition camp earlier this month.
Anti-Beijing protesters plan to hold demonstrations on Thursday evening in support of Catalan protests, which re-started over jail sentences handed out to nine separatist leaders.
The Chinese territory is in its fourth month of protests that started with opposition to a proposed extradition law and have expanded to include demands for greater democracy.
Hundreds of pro-Beijing demonstrators sang the Chinese national anthem, waved red flags and chanted slogans at Amoy Plaza in the densely packed Kowloon district.
University and school students swapped their classes with pro-democracy demonstrations. Hong Kong police arrested several demonstrators who disrupted the morning commute.
Pro-democracy demonstrators, including student protest leader Joshua Wong, were arrested ahead of celebrations marking Hong Kong's handover from Britain to China.
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