What is the ruling on women participating in a demonstration in France against the banning of the headscarf for girls in schools, and is it permissible to supplicate for the souls of those lost in the Egyptian plane crash?

If a demonstration is permissible, then there is no harm in a woman participating in it, provided she adheres to the Islamic guidelines, such as wearing the hijab, avoiding free mixing, and lowering the gaze. As for supplicating for those missing from the crashed Egyptian airplane, it is permissible only for the Muslims among them, because it is not permissible to supplicate for forgiveness and mercy for a disbeliever.