The opening ceremony is a big show that happens before an important event like the Olympics or the World Cup. It's like a big party for everyone who is going to watch the event. During the opening ceremony, there are lots of things happening like music, dancing, and special performances.
At the beginning of the ceremony, there is a parade of all the countries who are taking part in the event. People from each country come out in special outfits and hold their country's flag. They walk around the stadium and wave to the crowd. This is to show that all the countries are coming together to compete and have fun together.
After the parade, there might be more music and dancing. Sometimes there are big displays of fireworks and lights. There might be famous people giving speeches or performing. Sometimes there are also special appearances from important people like the country's president or the leader of the event.
The opening ceremony is important because it gets everyone excited and ready for the event. It's like the beginning of a big adventure. By the end of the ceremony, everyone is excited and cheering, ready to see all the great things that will happen during the event itself.