The Ruling on Selling via Salam with a Term Extending to the Disbelievers' Festival

Answer : The calendar is fine, because the calendar is a marker for a month. However, the disbelievers' festival should not be a valid term for the transaction, because this festival, which I mean, is a religious symbol for the disbelievers. Therefore, it is not permissible to set the terms of sales for Muslims to this religious symbol.