Representatives of only four groups showed up on Monday to attend a meeting on possible amnesty for political offenders called by Deputy House Speaker Charoen Chankomol.
The discussion, chaired by Mr Charoen, begun about 10am in an uninspired atmosphere.
The representatives of the four groups were: Korkaew Pikulthong of the United Front for Democracy against Dictatorship (UDD); Udomdej Rattanasathien and Samart Kaewmeechai of the Pheu Thai Party; Gen Dapong Rattanawusan, the deputy army chief, representing the army; Gen ML Prasobchai Kasemsant, the second deputy defence permanent secretary, representing the Defence Ministry; and Pol Col Seri Khairassami representing the Ratchaprasong traders.
The Democrat Party, the Bhumjaithai Party, the People's Alliance for Democracy (PAD), the Pitak Siam group and the multi-colour group did not send representatives.
Nicha Hirunburana, wife of the late Gen Romklao Thuwatham, killed during the 2010 riots, also did not show up.
Mr Charoen wanted representatives of various groups affected by street riots to meet together to forge a consensus on who should be granted amnesty.