I think one of the biggest and most popular annual festival is the Busan Firework Festival. This year, the festival will happen on November 4th under the theme “Dream.”

The results of which city will host the World Expo 2030 will be announced this November. The theme of the firework festival is fitting because Busan citizens are dreaming about winning.
The firework show is scheduled for 8 pm that day, however, there will be street performances happening at Gwangalli Beach from 2-6 pm.
The temperature fluctuates throughout the day, do dress accordingly.
Over 1 million people are expected to visit the Gwangalli Beach area that day, so be cautious.
However, if you are not a fan of crowds, Gwangalli is not the only place to enjoy the firework festival. The fireworks can be seen across the city, including Dongbaek Island, Marine City, Igidae Park and Hwangnyeongsan Mountain.