La. Stat. tit. 13 § 4347
In all cases where judicial sales have been advertised under an order of court, whether by the sheriff, constable, auctioneer, or any other officer, at a particular place, and where by destruction of the place, whether by fire or otherwise, it becomes impossible to make the sale as advertised, the sale may be advertised to be made in front of the court house of the parish. This may be done without commencing the advertisement anew, but by simply changing it in the insertion next after the fire or other circumstances which require the change. If the change should be necessitated within less than a week before the date of the sale, as advertised, then the sale shall not be made for one week after the original date, and the advertisement shall be changed accordingly.
La. R.S. § 13:4347