Translation of "Demonstration" in Chinese

I'm going to join a demonstration.

我要参加一个示威游行。

Dozens of young people attended the demonstration.

几十个年轻人参加了示威游行。

Their small protest triggered a mass demonstration.

他們小型的示威引發了一場大規模的遊行。

Did the union participate in the demonstration?

工会参加了示威游行吗？

Several dozen young people participated in the demonstration.

几十个年轻人参加了示威游行。