Historically, this only occurred over the eve of the entire moon. So the top time to go to Hoi An was throughout the entire moon. With the event of tourism in Hoi An, this now comes about on the nightly basis, so daily is the best time to go to! https://hoiinan61604.ampblogs.com/5-tips-about-hoi-in-an-you-can-use-today-76031279