What is the ruling on organizing parties that do not involve alcohol? Is it permissible to delay payment to a seller and invest the money after he agrees to the delay?

You are permitted to work in party planning if the purpose of the parties is permissible and free from forbidden acts. It is not permissible to work in parties that include prohibited things such as alcohol, dancing, and musical instruments.

The brokerage fee is not forfeited if the sale is canceled by mutual agreement without a valid reason. However, if the cancellation is due to a valid reason, such as a defect in the item sold, then there is a difference of opinion among scholars regarding the entitlement to the fee. The more cautious approach is to return the fee.

If the fee must be returned, it is not permissible to delay its return and invest it except with the owner's permission.