Absolutely. A chocolate cake freezes well for up to 3 months. Once the cake is completely cooled, leave it unglazed and wrap the cake with a few layers of plastic wrap followed by a sheet of aluminium foil. Place the cake flat on the freezer shelf, and make sure you don't stack anything on top. The day before serving, transfer the cake from the freezer into the chiller. While still wrapped, let it thaw overnight. Alternatively, pull the chocolate cake from the freezer, remove the wrapping and let it thaw at room temperature for 2 to 3 hours. Drizzle with chocolate glaze just before serving.