festive russian

• торже́ственный

  solemn, festive, ceremonial

  triumphant

  (relational) fest, gala

• пра́здничный

  holiday, festive

• засто́лье

  feast, taking part in a festive meal

• и́грище

  public merrymaking, festive gathering of young people

• вечери́ночный

  party (as in: party dress), party-like, festive

• наряжённый

  dressed up, festive, elegant, adorned

• пра́зднично

  festively

• нарядно

  smartly, elegantly, festively, gaily

• расцве́ченный

  multicolored, brightly colored, gaily colored, festively decorated