Is it permissible to attend events in a wedding hall if it is suspected that the money used to build it was unlawfully acquired?

The ill-gotten money, due to how it was acquired, is tied to the owner's responsibility, not to the specific structure built with it or what it was spent on. Therefore, there is no harm in attending events held in the aforementioned wedding hall, as long as these events do not involve prohibited matters such as intermingling (of sexes) or unlawful music.