What is the ruling on the profession of party planner and wedding decorator, given that there is a possibility of forbidden songs and segments therein, knowing that the work finishes before the wedding or party begins?

Work is permissible in principle. However, if a woman knows or predominantly believes that a place will be used for forbidden acts, such as musical instruments and intermingling, then it is not permissible for her to prepare it. This is because it constitutes aiding in sin, even if her role ends before the party begins, based on the Almighty's saying: "And do not cooperate in sin and aggression." Indeed, everyone involved with alcohol has been cursed, even the helper and the preparer, if they are aware. Therefore, the woman must fear Allah and abandon this work, or limit herself to preparing the place only for those who will not use it for forbidden purposes, and purify her intention to Allah in abandoning it. For Allah will compensate her with something better.