Phra that phanom is the Buddhist people, especially common in the Northeast, including the Lao side. In a full third of every year there will be a Buddhist work pouring Sompoch Phra that phanom from all directions.
Phra That Phanom is revered by Buddhists in general. Especially in the Northeast, including with Laos. In the third lunar month every year to attend a Buddhist ceremony Tatupnm surge from everywhere.