Ключевые слова: 60, activities, activity, air, amazing, asia, asian, campaign, ceremony, city, crowd, crowded, dark, dense, earth, earth hour, electricity, evening, event, events, global, green, group, ho chi minh, ho chi minh city, hour, impressive, international, lifestyle, movement, night, open, operate, operation, outdoor, people, performance, person, raise hand, respond, spirit, stage, teenager, viet nam, vietnam, vietnamese, volunteer, worldwide, young, youth,