Yes! Here are the details of making ahead: Macaron shells - You can bake the shells in advance and store them in an airtight container in the fridge, layered between pieces of parchment paper. They will keep, unfilled, for 5 days in the fridge. If you plan on making them further in advance, pack them carefully into an airtight container and store in the freezer. Defrost them in the fridge before filling. Salted caramel sauce - Salted caramel sauce will keep in the fridge for 2 to 3 weeks. You may also freeze it (in a container that allows for expansion) for up to 3 months. Be sure that your caramel sauce has warmed to room temperature before you use it in the recipe. Salted caramel Swiss meringue buttercream - You can make Swiss meringue buttercream in advance and store it in an airtight container at room temperature for up to 2 days. It will keep in the refrigerator for up to 2 weeks, and in the freezer for up to 3 months. If you are not using the buttercream immediately, you will need to beat it again to achieve the light and silky texture. Make sure it is at room temperature before you begin. If it breaks upon remixing, refer to the troubleshooting section.