According to the sources, Lalu's health condition is stable and the RJD chief had returned to Bihar last month after over three years.
The veteran politician is learnt to be suffering from fever and is drowsy. His condition is not serious and is stable.
President Ram Nath Kovind will address the function.
AICC general secretary Tariq Anwar made a statement to this effect in reply to questions from journalists about the party's future course with respect to its ties with the RJD.
The Court also imposed the condition to deposit two sureties of Rs 1 lakh each and a fine of Rs 10 lakh.
Time for opposition to bury differences, join hands to dislodge dictatorial Modi govt, says RJD chief Lalu Prasad Yadav
The country is passing through an unprecedented phase of dictatorial governance and time has come for all opposition parties to unite against this “anti-people” BJP government,
Prasad's attempt to disown the controversial move of Kumar came at a time when the latter is facing the heat over a large number of deaths caused by consumption of spurious liquor.
Centre's ordidance to extend CBI, ED directors tenure is attempt to destroy democratic institutions: Manoj Jha
The Centre on Sunday moved an ordinance that extends the tenure of ED director and CBI director to five years.
RJD leader Tejashwi Yadav on Sunday launched a blistering attack on the Nitish Kumar government in Bihar.
The RJD’s defeat in the two Assembly bypolls in Bihar is believed to have weakened Lalu Prasad’s position in the non-BJP opposition at the national level.
Congress leader Kanhaiya Kumar and others also campaigned for three days. In both constituencies, the Congress candidates forfeited their deposits.
Tej Pratap Yadav openly blamed the state president of RJD Jagdanand Singh and two others for the defeat of the party in assembly by-polls.
Bypoll roundup: BJP consolidates in Assam, MP; Congress wrests seats from it in four states; TMC reigns in Bengal
Voting was held on Oct 30 for the bypolls, seen as a barometer of the overall political mood ahead of the next round of assembly elections in five states, including politically critical Uttar Pradesh.
The results have come as a dampener for the RJD, which is in the opposition despite having the largest number of MLAs and was confident of clinching both seats.
In Tarapur, JD(U) candidate Rajiv Kumar Singh defeated his nearest rival of the RJD, Arun Kumar Sah, by a slender margin of less than 4,000 votes, according to the Election Commission.