A "peaceful demonstration" refers to a gathering or event where people express their opinions or concerns in a peaceful and non-violent manner, usually by marching, holding signs, or speaking out. Full definition
Join one of the many grassroots groups organizing to stage peaceful demonstrations in support of keeping schools and children safe. (ucea.org)
Look, I know that shutting down is a sort of peaceful demonstration. (edutopia.org)
The most successful way to accomplish this is by organizing rallies and peaceful demonstrations outside of pet stores that sell puppies. (nationalpuppyday.com)