I say, and with God's success: It is not permissible for a woman to travel the usual travel distance except with a mahram relative, as the hadiths have repeatedly stated. There can be exceptions for necessity in special cases, but a trip consisting of a group of women is not one of them, especially when women gather in this manner for such matters, as there are numerous prohibitions and very negative effects on them. From the perspective of religious rulings, they have committed a major sin, and from the perspective of harm, they put themselves in danger. And God knows best.