the calm before the storm idiom
暴风雨前的平静（指重大活动、激烈辩论或灾难发生之前的平静）
a quiet or peaceful period before a period during which there is great activity, argument, or difficulty
I like to get everything done before the guests arrive and relax for a moment in the calm before the storm. 我喜欢在客人到来之前把什么都做好，然后利用暴风雨前那一刻的平静让自己放松一下。