I owned a banquet business for years. I did every cake. I also worked in a bakery when I was very young. There is nothing wrong with putting them in the freezer. FREEZE those cupcakes! I actually think they are more "moist' when you serve them. If I were you, go buy the buttercream and chocolate. Don't buy the little ones from the grocery. Go to a Sam's Club etc.. If you call your local grocer or bakery, they will order it in for you. Just add any flavoring you...