Sacrifice starts

Yudhistira bowed down before  Bhishma ,Drona ,Kripa , Aswatthama and Duryyodhana and asked for their blessings.
 He appointed Dussasana to oversee the department of food . Aswatthama was asked to attend on the Brahmanas. Sanjaya was appointed to offer return gifts to  the invited kings. Bhishma and Drona looked over to see if everything going as per procedure. Duryyodhana was in charge of collecting the gifts brought by the invited kings. Krishna went about welcoming the Brahamans.

Bhishma asked Yudhistira to ensure that the invited guests was treated with respect and all were given offerings from the sacrifice. Yudhistira asked Bhishma who should be the first to receive the offerings. Bhishma said Krishna deserved this and he should be treated as the supreme and be worshipped.
As the sun is the most brilliant among all, so is Krishna, Bhishma said. The sacrifice is illuminated by his presence.
Thus commanded by Bhishma, Yudhistira and Bhisma both worshiped Krishna. The king of Chedi, Sisupala did not like this.

He said Krishna did not deserve this respect. Bhishma who was not even a king, had no right to suggest names of who deserved this respect. If some one had to respected, it should be Krishna's  O bull of the Kuru race, if thou regardest Krishna as the oldest in age, here is Vasudeva, and how can his son be said so in his presence? Or, if thou regardest Vasudeva father, Vasudeva, who was elder to Krishna in age and wisdom. There were other warriors like Drupada who could be respected. So, why Krishna? There were warriors like Drona and Kripa who deserved this and not Krishna.
Krishna was not a priest . By worshiping Krishna, the other mighty kings were being insulted.

Having said this, Sisupala walked out of the assembly hall. Yudhistira tried to get back Sisupala. He ran after him and said Bhisma knew Krishna better than others and there would be a reason why he had chosen him.
Sisupala then started asking the assembled kings to support him.  Approaching Bhisma, Yudhistira wanted to know how to tackle this situation. Bhishma asked him not to worry. The dogs would bark but they would be able to harm a lion.

Sisupala said Bhishma was old and did not know what he was saying. Krishna had slain all who were weak. He slew Kamsa who was his relative. He said Bhishma's celebacy was from ignorance and not for any virtue.
Continuing, he said there was once an old swan who always spoke of morality. Other birds would leave their eggs with him to watch over. This bird, seeing the other birds had gone, would eat up the eggs. When the other birds saw this, they attacked and killed the swan. Bhishma was like this swan.

Bhima was enraged to hear these words of Sisupala. Bhishma then tried to pacify Bhima.

Killing of Jarasandha and Start of the crowning

Krishna told Bhima to show the strength he had. Bhima lifting  Jarasandha, began to whirl him in the air. Bhima pressed his knee against Jarasandha's backbone and broke his body in twain. And having killed him , Bhima uttered a terrible roar. The citizens of Magadha became dumb with terror . Krishna then freed the kings that Jarasandha had imprisoned.

(Mahabharata serial showed Bhima trying to kill Jarasandha and failing till Krishna showed him how. Whenever Bhima would split Jarasandha's body, it would join itself. Krishna showed the way by taking a twig and throwing that apart in reverse directions. This is mentioned in the Bhagwad Purana, not in Vyasa's Mahabharat).

Krishna had Jarasandha' son , Sahadeva, crowned king of Magadha. Krishna  along with the Pandava princes returned to Yudhistira's kingdom, which now called Indraprastha.

 Accompanied by Bhima and Arjuna, Krishna arrived at Indraprastha, and gave Yudhishthira the news of the death of Jarasandha.
Krishna then departed for Dwaraka.

Arjuna then wished to go out and capture some land and increase the wealth in their treasury by obtaining the same from the defeated kings. Seeing this, all brothers set forth in different directions. If they were able to conquer enough kings, Yudhistira would be crowned emperor.

Yudhistira proved to be a great king. All were happy under his protection.  There were no droughts and floods. It was time for Yudhistira to be crowned emperor. Krishna came from Dwaraka bringing many gifts. Addressing Krishna, the Pandavas requested him to stay and requested him to be the cheif guest for the ceremony.
With Krishna's permission, gathering material for the sacrifice started.
Invitations were sent out to invite all.

The kauravas, Bhisma, Drona, Dhritarashtra, Vidura and other elders were invited to attend the ceremony.

Nakula went to invite the Kuru elders from Hastinapur. Dhritarashtra ,Bhishma ,Vidura , the Kaurava brothers with Duryyodhana, Suvala the king of Gandhara and Sakuni  and Karna came there with Nakula to attend the ceremony.

The ceremonies started with Yudhistira worshiping the brahamans present.