Translation of "Grassroots" in French

At a grassroots level, it is mandatory to take action.

Au niveau local, il est nécessaire d'agir.

Now it is a really lovely, charming, grassroots event in Queens

C'est un charmant et agréable événement populaire dans le Queens

This company created fake grassroots organizations to make it look like ordinary citizens were supporting its project.

L'entreprise a créé de fausses associations citoyennes pour que ses projets semblent appuyés par la population.