This is the 15412th most frequent Russian word.
праздничной
Festive.
The word 'праздничной' here describes the manner of the decoration, indicating the festive and celebratory style.
Эта комната украшена в праздничной манере.
This room is decorated in a festive manner.
In this sentence, 'праздничной' modifies 'цветовой гамме', showing that the color scheme is associated with a festive or celebratory theme.
Она выбрала наряд в праздничной цветовой гамме.
She chose an outfit in a festive color scheme.
Here, 'праздничной' describes the atmosphere, emphasizing its lively and celebratory nature.