On Etterbeek’s website, they give a few more details about the area that will be closed.

    Rue Général Leman (du n°119 au n°145)
    Chaussée Saint-Pierre (du n°3 au n°23)
    Rue de Pervyse (du n°80 au n°56)

A good way to do it would be to use access:conditional in OSM.
Ideally with proper hours—they say it ends on 10:00 p.m. but do we know what time of the day it starts?