Is my work as a fire alarm technician at the Opera House, and the wages and bonuses I receive for maintaining these devices, permissible or forbidden, knowing that the Opera House parties are based on singing, dancing, and playing music?

It is not permissible to work in a house that hosts unlawful dancing and singing parties, because it involves cooperation in sin. The wages earned from this work are unlawful, and one must dispose of them by giving them to the poor and needy. If the worker was previously ignorant of the impermissibility of his work, he may benefit from what he has taken, provided he repents and abandons the work. As for one who knew of the impermissibility, he must repent and spend what he received on good deeds and charity.