Advance prep options: You may prepare the spread up to a few days in advance and then cover and refrigerate. Soften at room temperature before spreading on the rolls. The sandwiches may also be fully prepared one day in advance. Make sure they are well wrapped and then refrigerate until ready to bake. The unbaked sandwiches may also be frozen for longer storage. For best results, thaw before baking.
To freeze: Wrap the sandwiches but do not bake. Place in a zip-top bag or airtight container and store in the freezer for up to 3 months. Thaw and bake in the foil as directed. (I have baked from frozen, adding 5-10 minutes to the cooking time, although the bread has the potential to dry out before the center is heated through.)