The additional seats will be provided through the early opening of the A4 grandstand to meet strong demand from residents and visitors eager to watch the fireworks displays.
The fifth and final qualifying night of the festival will take place on June 27 under the theme 'Vision', featuring teams from Australia and Portugal.
Organisers said the festival continued to attract large crowds, with grandstands regularly reaching capacity and popular viewing spots along the Han River, Dragon Bridge and Tran Thi Ly Bridge drawing spectators well before the shows began.
Beyond its cultural and entertainment appeal, the festival has also boosted tourism in Danng.
According to organisers, the city welcomed more than 326,000 visitors after the first three competition nights, up 36.7 per cent from the same period last year. International arrivals exceeded 136,000, while domestic visitors totalled nearly 190,000.
Average hotel occupancy across the city surpassed 70 per cent, with many riverside and beachfront hotels reporting particularly high occupancy rates on weekends.
Restaurants, river cruises, entertainment venues and fireworks-themed tour packages have also seen strong demand during the festival period.
DIFF 2026, jointly organised by Danang authorities and Sun Group, runs from May 30 to July 11 and features 10 teams from Vietnam, China, France, Japan, Italy, Germany, Portugal, Australia and Macau.
The final is scheduled for July 11.
