The artists said they supported the student-led pro-democracy movement and wanted the university to allow the protest to be held at the Tha Phra Chan campus.Meanwhile, former university vice rector Kaewsan Atibodhi has collected close to 3,000 signatures to oppose the protest.Last week, Thammasat University issued a statement prohibiting the September 19 rally at its Tha Phra Chan campus citing safety and other concerns.