You can make parts of it the day before (see above), but I would recommend assembling it right before serving. That way the cake won't get soggy and the fruit will stay fresh. Save yourself some time by baking, slicing, and mixing each element the day before so that assembly is super fast and easy when ready to serve! This is best assembled right before serving (or if needed an hour or 2 beforehand and keep stored in the fridge until needed).