In today’s world, the mode of expressing indignation and outrage against oppression assumes many forms. Among these is the practice of holding demonstrations, protest marches, rallies, vigils, and so forth. At many of these rallies, there is music, intermingling, missing of Salah, blocking of roads, thus inconveniencing people in their daily movement, vandalism, coercion and so forth.
Is it permissible to join protest marches? here is Dr. Islam Muhammad explaining from an Islamic perspective.
https://www.facebook.com/Daktuur/videos/801755373617811/