AI have been asked to make a friends wedding cake and have a few questions.  I am planning on red velvet with cream cheese frosting, and after reading enough about it, have decided to use buttercream icing.  I already have a great cake recipe, but could use some suggestions on the buttercream.   Biggest concerns are about when to make.  I don't want to freeze, but Want the least amount of work on the day of.  I will be making the cake in three layers, to feed aprox. 100, and also about 50 mini cupcakes and 50 whoopee pies.  The cupcakes and pies I'm okay with making day before, but was concerned more about the cake. I'm thinking to bake the cakes on thurs, and ice, fill and basically finish on fri.  I will assemble at the reception.  Keeping it very simple on the outside, if you google 'rustic wedding cake' and look at the images, I'm planning on doing the style like either the one with raffia on the first row (third from the left), or the second row (fourth from the left).  Can I assemble and leave it out the night before? Thanks in advance for all your help and advice!

Definitely have the cake assembled the night before, helps to make sure everything is settled.

It would also be fine if you baked the cakes on the Wednesday.