Yadav, through an application written to Jail IG Harsh Magla, had demanded five-day parole to attend his son's wedding.
Lalu Prasad Yadav, former Chief Minister of Bihar and Rashtriya Janata Dal (RJD) chief, was granted parole on Thursday to attend his elder son Tej Pratap's marriage ceremony.
Meanwhile, the Ranchi High Court on Friday granted a provisional bail of six weeks on medical grounds to Lalu Prasad.
Lalu Prasad, Rabri Devi, their daughter and party MP Misa Bharti, theuir son and former deputy chief minister of Bihar Tejashwi Prasad Yadav also figure on the billboard.
The high profile wedding, which according to reports is set to see over 10,000 guests (an estimate given by RJD leaders), has been the talk of the town as speculations over Lalu Yadav's parole heightened as the marriage date approached.
The couple will tie the knot on 12 May at Veterinary College ground in Patna.
In the Birsa Munda jail here since December 23, 2017 being convicted in a fodder scam case, he was admitted to RIMS on March 17 following complaints of uneasiness.
Lalu Prasad Yadav's wife and former Bihar CM Rabri Devi were seen exchanging pleasantries with CM Nitish Kumar as they sat on a sofa together.
The wedding rituals were later held at the 5, Circular Road bungalow of Aishwarya's father Chandrika Rai, MLA, well past midnight with only close relatives and friends in attendance.
Tej Pratap Yadav, the oldest of the nine siblings, is now an first-time lawmaker and was a health ministry before last July, once Nitish Kumar dropped the RJD and formed a new government with the BJP.
RJD leaders further explained that supporters in large numbers poured in from all across Bihar, Jharkhand, Uttar Pradesh and West Bengal.