热闹 is a highly valued quality in Chinese culture. Holidays, weddings, and family dinners should be 热闹. The phrase 凑热闹 (còu rènao) means to join in the fun or excitement, sometimes as a busybody.
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看热闹 (kàn rènao) means to watch the spectacle or excitement, often as a bystander. It can be neutral or slightly negative (rubber-necking).
