Rule 2 of 20: Pay attention to the time stated on the invitation. Suppose it is 8pm. Before that time, the hostess will be frantically laying the table, cooking and getting herself ready, while the man in her life tells her to calm down and wonders where he put the corkscrew. After 8.30pm, she will be fretting because the food’s burning and everyone’s cancelling at the last minute (see rule1). To minimise grief, try arriving within half an hour of the stated time. You can manage that when you go to the cinema. Do it for dinner, too.