根据昌平区的发展计划和政府公告，昌平区将在未来的某个时间点停工，以进行改造和升级。具体停工时间尚未公布，但政府已经发布了相关的通知和公告，以告知企业和居民停工计划。

停工的原因是为了改善昌平区的城市环境和基础设施，提升城市的品质和形象。政府计划对昌平区进行一系列的改造和升级，包括建设新的道路、公园、商业中心等，以提供更好的生活和工作环境。

停工期间，企业和居民需要配合政府的工作，遵守相关的规定和安排。政府将为受影响的企业和居民提供必要的支持和帮助，以确保他们的利益得到保障。

英文翻译：
According to the development plan and government announcement of Changping District, the district will stop working at a future date for reconstruction and upgrading. The specific shutdown time has not yet been announced, but the government has issued relevant notices and announcements to inform enterprises and residents of the shutdown plan.

The reason for the shutdown is to improve the urban environment and infrastructure of Changping District, and enhance the quality and image of the city. The government plans to carry out a series of reconstruction and upgrading in Changping District, including the construction of new roads, parks, commercial centers, etc., to provide a better living and working environment.

During the shutdown period, enterprises and residents need to cooperate with the government's work and comply with relevant regulations and arrangements. The government will provide necessary support and assistance to affected enterprises and residents to ensure that their interests are protected.