As the 34th anniversary of China’s Tiananmen Square crackdown approaches Sunday, many in Hong Kong are trying to mark the day in private ways in the shadow of a law that prosecuted leading activists in the city’s pro-democracy movement.

For decades, Hong Kong was the only place in China where people held large-scale commemorations about the 1989 crackdown on pro-democracy protesters in which tanks rolled into the heart of Beijing, and possibly thousands, of people were killed.