Act 3, Scene 4 shows the feast to celebrate Macbeth's coronation. After Macbeth and Lady Macbeth welcome their guests, the First Murderer comes to the door with the news, which he delivers to Macbeth privately, that Banquo is dead, though Fleance has escaped.
I don't if this answers the question, since I'm not sure how "prior to his feast" should be interpreted.
Macduff blames himself for their death (because he left them unprotected).
He is told by Ross in his castle. After, he decides to take vengeance on Macbeth
Ross informs Macduff that his wife, children, and household have been brutally murdered by Macbeth's orders. This tragic news serves as a turning point of motivation for Macduff to seek revenge against Macbeth.
Ross informs Macduff that Macduff's family has been murdered on the orders of Macbeth.
How does lady macduff reaction the news that macduff fled England
Lennox informs Macbeth that Macduff has fled to England to seek help from King Edward to overthrow him.
Macduff reacts to Ross's news with shock and grief upon learning that his family has been murdered. He is devastated by the loss but uses his anger and determination to seek revenge against Macbeth.
Ross likely felt conflicted and burdened when he informed Macduff about the fate of his family. He may have experienced a mix of guilt, sorrow, and the responsibility of delivering such tragic news to Macduff.
In Act 4 Scene 2 of the Shakespearean play, Macbeth [c. 1014-August 15, 1057] succeeded in getting Macduff's entire family and household killed by hired murderers. Macduff wasn't among the intended victims, because he had fled across the border into England. He was ignorant of the bloodied happenings at Fife Castle until a noble acquaintance tracked him down in England. The nobleman who broke the heartbreaking news to Macduff was Ross.
Ross is a messenger. Every time there is a message to be delivered, Ross is delivering it. He should be portrayed as a courier. We first meet him when he is bringing news to Duncan of the battle in Fife and Cawdor's treachery, then he brings news to Macbeth that he is now Thane of Cawdor, then he brings messages to Lady Macduff, and finally brings news to Macduff that his family has been slaughtered.
In Act 4 Scene 1, Macbeth [c. 1014-August 15, 1057] met first the three witches and then the noble Scotsman Lennox. Lennox told Macbeth that Macduff had fled Scotland. The news was disappointing to Macbeth, who was planning to kill Macduff. But he quickly adapted to the change in situation. He decided to have Macduff's entire family and household slaughtered.
Ross told Macbeth that he was now the thane of Cawdor just after the 3 witches made that prediction