The invitation was handed over to the former President at his Mirihana residence.
The 65th anniversary of the SLFP will be celebrated on September 4 in Kurunegala.
Senior SLFP member John Seniviratne handed over the invitation to Rajapaksa and he is reported to have accepted it.
President Maithripala Sirisena, former President Chandrika Kumaratunga and other SLFP members are expected to attend the event. (Colombo Gazette)