For many people from Ukraine - new year and Xmas the same in mind. So it is the reasons of mistakes.
New Year - this usually "Оливье", "Селёдка под шубой", "Холодец" ( Save name for best search of receipts).
Xmas - we have dinner in the Xmas day and dinner one day before Xmas(Saint evening). Reason - ortodox Christian's have fast before xmas. So day before Xmas - 12 dishes without egg,milk,butter, meat. Main of this dishes - Кутя. Kutya - wheat grains with water and some sweet ingridient, and it should be first dish of dinner. In the day of Xmas you can eat everything)