First they drink toasts to them, then frighten them, then push them unceremoniously out of the door.
She was freightened and started to realise that Macbeth was ill. She sent all of the guests home, saying that the illness was nothing out of the ordinary for him and she explained to Macbeth that it was all his imagination.
Macbeth is charged to not fail the feast by Lady Macbeth. This is ironic because, despite her admonition, Macbeth does indeed fail to keep the feast when he sees the ghost of Banquo, revealing his guilt and inward turmoil to all the guests. This contrasts with Lady Macbeth's efforts to maintain an appearance of normalcy and control.
Lady Macbeth is the more forceful, probably because she is less foresighted. Macbeth knows the likely consequences of his acts, but she does not. She cannot imagine the downside to the murder; all she sees is herself as the chatelaine, hosting dinner parties. This lack of foresight gives her the strength to use everything she's got to persuade Macbeth to the murder.
duncan
It depends which Macbeth freakout you are talking about: the one after he commits the murder (where he freaks out about not being able to say Amen) and the other at the dinner party (when he sees the ghost of Banquo). One of my favourite lines from the former is "Infirm of purpose!" and from the latter, "When all is done you look but on a stool!"
Macbeth and lady Macbeth try to avoid suspicion by getting into their pajamas after committing the murder so people will think they were asleep all the time.
Lady Macbeth echoes the words of the witches when she says "All hail, Macbeth, that shalt be king hereafter!". This echoes the witches' prophecy that Macbeth will become king.
Macbeth is instantly filled with depression and guilt over what he has done to Banquo and leaves the hall where he is dining with his nobles. Lady Macbeth announces that Macbeth is sick and tells them all to leave but this is only his depression. !
Lady Macbeth's plan was that Macbeth would murder Duncan, nobody would ever blame him or her, and they could happily be king and queen and she could throw lots of fancy dinner parties. What goes wrong is that Macbeth is driven crazy by guilt, becomes a paranoid loner, and wrecks the dinner parties by screaming at ghosts nobody can see. As she says: "Nought's had, all's spent, when desire's had without content". In other words it has turned to ashes in her mouth. Worse, Macbeth's paranoia and craziness has made him do things which will make people suspect him. This makes Lady Macbeth worry constantly that the murders will be brought home to them, which ironically makes her crazy and makes her spill the beans while sleepwalking. But she cannot correct her error. Duncan is dead; he cannot come out on's grave.
The contents of Macbeth's letter to Lady Macbeth was about Macbeth's prediction from the 3 witches he met in the beginning - about him being the Thane of Cawdor (thane means prince/king) and then the King of Scotland. Lady Macbeth becomes hyped, because she was waiting for the chance to have all the power to be a queen.
Macbeth does the things he does(like kill Duncan) because Macbeth is manipulated and coaxed by Lady Macbeth to do them. On his own, he would not have done so even though he was ambitious. Lady Macbeth, does the manipulating and all the cruel lines that she says are of her own accord. Nobody forces her, she choses to become evil while Macbeth is forced to become evil.
* You personally 'phone' (not email) all the guests and apologize to them that the dinner party was canceled for personal reasons and that you will organize another dinner party as soon as possible. Get in touch with your guests if you can before the weekend so it gives them a chance to make other plans.