People who want an alternative force should be listened to, as the JVP has begun supporting the government, and certain SLFP MPs have accepted ministerial positions, he has told BBC Sandeshaya.
He accused president Maithripala Sirisena of having conspired to obtain leadership of the SLFP, and also that he was now fulfilling a contract by the UNP.
Participation in the 65th anniversary celebration will be decided after consulting the party Bala Mandala, he said.
Meanwhile, SLFP general secretary Duminda Dissanayake says the party can take a decision against MPs who do not listen to its leadership.
Party treasurer S.B. Dissanayake says persons who try to divide the party will not be tolerated.