金吾不禁

Explanation: Kingo: Qin and Han Dynasty garrison of the local officials in charge of the capital. This refers to the ancient times, before and after the Lantern Festival and the day, all night lanterns, local officials cancel the curfew. Refers to no curfew after the night out unimpeded. 　　Source: Tang Wei reference to "the West are Miscellany": "West is the capital Jie Qu, a paging Kingo dawn dark to ban nocturnal; but the fifteenth night of Chile Xujin Wu Chi village, before and after the day." 　　Examples: North Gate tube key, also do not actually eve key is useless so-called ~ Secular? (Qing Wang Tao, "Ying land under wall magazine")