If you want to make this recipe ahead of time: You may do by baking the Lasagna Bolognese, slicing it, cool it in the fridge and either:
1 - store it covered in the refrigerator for up to two days and warm it up in a 250 F oven until heated through (takes around 40 minutes or so, check to make sure it is completely hot inside before serving), OR
2 - Freeze the slices by putting them in a freezer safe airtight container after covering them up well with an aluminum foil. When ready to serve, defrost in the fridge for 24 hours, then follow the #1 instructions.