2 sentences

1. 校庆活动的筹备工作正在紧锣密鼓地进行中。

   xiào​qìng huó​dòng de chóu​bèi gōng​zuò zhèng​zài jǐn​luó​mì​gǔ de jìn​xíng zhōng.

   Preparations for the school anniversary are in full swing.

   Source: Dong Chinese Dictionary

2. 戏台上突然响起了紧锣密鼓，观众们立刻安静了下来。

   xì​tái shàng tū​rán xiǎng​qǐ le jǐn​luó​mì​gǔ, guān​zhòng men lì​kè ān​jìng le xià​lai.

   Sudden intense drumming and gongs sounded on the stage, and the audience immediately fell silent.

   Source: Dong Chinese Dictionary