盛大 + 的 + Noun
The adjective 盛大 (shèngdà) means "grand," "magnificent," or "spectacular." It is used to describe events, ceremonies, or occasions that are impressive in scale. For example, 盛大的婚礼 means "a grand wedding."
他们在海边举办了一场盛大的婚礼。
Tāmen zài hǎibiān jǔbàn le yī chǎng shèngdà de hūnlǐ.
They held a grand wedding by the sea.
国庆节的时候,广场上有盛大的庆祝活动。
Guóqìng jié de shíhou, guǎngchǎng shàng yǒu shèngdà de qìngzhù huódòng.
During National Day, there are grand celebrations in the square.
这是我见过的最盛大的音乐节。
Zhè shì wǒ jiànguò de zuì shèngdà de yīnyuè jié.
This is the grandest music festival I've ever seen.