Fireworks, a gala variety show and Chinese military displays are among the official events planned to coincide with a visit by Chinese President Xi Jinping starting Thursday to mark the occasion. Ahead of the anniversary, state broadcaster China Central Television has been running daily news features extolling what it calls the inextricable ties between China and Hong Kong in fields ranging from sports to the military and the arts. “People are not celebrating but worrying about Hong Kong’s future and its current situation,” said Nathan Law, who at age 23 was elected the city’s youngest-ever lawmaker last year and was a student leader of 2014’s large “Umbrella Movement” pro-democracy demonstrations. Planned protests include a rally by a pro-independence group on Friday evening and a pro-democracy march Saturday, the latter an annual event that has drawn big crowds in the past.