The congress will be attended by 1,587 delegates representing 5.1 million Party members from around the country, the largest number at any congress so far.
The preparatory session will go through the meeting agenda and election regulations.
The congress opens on Tuesday and will last nine days, during which it will select the new leadership of the Party, state, government, and National Assembly for the next five years, besides finalizing socio-economic development policies for 2021-25 and orientations for until 2030 with a vision toward 2045.