Do you think it is easy to organize a good party? what mistakes do people sometimes make?

I think that to organize a good party is not so easy, because you need to consider all the details and be sure to make a list of such guests, food and drinks, contests and etc. so you should check whether you have enough dishes, forks, cups, plates and other. people often make mistakes in cooking parties. for example people can not ensure you have what I called earlier, or at a party tired and sad, it is very not like guests