Is working on developing a purchasing software for a company that organizes entertainment, sports, and cultural events, which include musical concerts and plays as part of them, considered permissible or forbidden?

It is not permissible for the questioner to work on designing a program for the purchasing department if she knows beforehand that it will directly assist in a prohibited entertainment activity (such as musical concerts), because hiring for prohibited benefits is unlawful, as is receiving or giving payment for them. It is also forbidden to sell something whose benefit is exclusively in something prohibited, or if its predominant use is in something prohibited, or if it is intended for use in a prohibited matter. Evidence for this includes the prohibition of selling female singers, as their predominant use was in unlawful activities.