Soft Cheeses: Soft cheeses (especially those made with unpasteurized milk) can be contaminated with listeria. With soft cheeses it's difficult to effectively trim away any moldy or spoiled portions. If soft cheeses like queso fresco, feta, brie, or blue are past their expiration date it's best to throw them away.
Sounds like a fun time! As for the nacho cheese sauce, yes, you can freeze it. Nacho cheese sauce will lose some of its consistency upon freezing, but it can be brought back to normal with a few tips. The following instructions apply equally to store-bought commercial nacho cheese sauce and homemade nacho cheese sauce.