brutus
The crowd did react to Brutus and Anthony funeral speeches because they had much intellectual appeal.
Cassius
what requirements must anthony abide by in order to speak at ceasars funeral
Mark Anthony must speak from the pulpit from where Brutus will deliver his speech. He must not speak any ill about the group which murdered Caesar. He will just speak whatever good he can devise of Caesar. He will speak in the pulpit after Brutus.
Brutus allowed Anthony to speak at Caesar funeral because he wanted him to eulogize his friend. He also did that because he was fair and compassionate.
Apart from Brutus and Antony, nobody spoke at the funeral. Unfortunately after Antony's speech a riot ensued and the crowd dispersed. One hopes that Antony had the decency to pick up Caesar's corpse from the Capitol steps and deal with it in some kind of hygenic manner.
The favor that Antony asks of the conspirators is to speak at Caesar's funeral. They eventually let him, however Brutus gives him guidelines/restrictions that he must agree too or else he will not be allowed to speak at the funeral.
Because Antony promised he would not do the very thing he ended up doing, and Brutus trusted him. Unfortunately for Brutus he really was an "honourable man".
Antony's agenda was to turn the crowd against Brutus in order to set up his own grasp for power. Brutus really underestimated his ability and power, and thought he could do no harm once Caesar was dead. He was wrong--Antony succeeded in his plot to become one of the rulers of Rome.
Brutus feels that it is only right to let Antony speak, because he was so close to Caesar and the only way that the conspirators can ever repay him in any way is to let him give a speech at Caesar's funeral.
In "Julius Caesar", Brutus tells Antony that he can't blame him and his co-conspirators for Caesar's death. He is told to say only the positive things he can remember about Caesar, and to let the plebeians know that the only way he is able to speak at the funeral is by Brutus' permission. Finally, Anthony can only speak from the platform where Brutus is to speak.
calmly