Most of the victims were government teachers attending a seminar at the hotel in Nakhon Ratchasima on August 13, 1993.
The collapse killed 137 people and injured 300.
“I still remember vividly what happened that day,” said Chavalit Tantaseraneewat, a former inspector general with the General Education Department.
Chavalit, who lost his right leg in the incident, blames substandard construction for the collapse.
“I hope hotel operators and construction-supervising engineers will all work hard and strictly uphold their ethics so that no such tragedy ever takes place again,” he said.