Guwahati: Bharat Tibbat Sahyog Manch, an umbrella body of Indians supporting the Tibet Mukti Sadhana (Tibetan freedom movement) has decided to observe forthcoming 20 October as a protest day against the Communist regime in Beijing as the People’s Liberation Army (PLA) attacked simultaneously on Ladakh and Arunachal Pradesh (then North East Frontier Agency) on this date in 1962.