China’s summer movie box office heads for an early winter on the dearth of blockbusters during Communist Party’s centenary

China is seeing one of its slowest summer holiday box office seasons in years after a delta-driven outbreak kept audiences home, while concerns grow that a regulatory crackdown on celebrities and idols could prevent the industry from bouncing back.Ticket sales during the June-August summer holiday amounted to 6.7 billion yuan (US$1 billion) as of Tuesday morning, according to ticketing platform Maoyan Entertainment. That’s the lowest number since 2013, excluding last year, which saw much of…