You need to obtain a VISA which can be either transit or visit to come and vsisit Dubai.
Obtained through a sponsour.
Visit VISA can be obtained through a sponsour. The sponsor can be your travel agency, your hotel, the company or department with which you are doing business in the UAE, or an individual (example: a relative or friend resident in the UAE).
During the shopping festival there are special arrangements made by the Govt. to issue additional VISAs as more people will be in the need of obtaining VISAs