Making prior appointments for a meeting in the US are necessary.

Unlike the UK, People in the United States write the month first, then the day, then the year [i.e., December 5, 2009 is written 12/5/09. In the UK, you would write it as 5/12/09].

Generally, the working week in the US is Monday to Friday, 8:30 or 9:00 a.m. to 5:00 or 6:00 p.m. Many people, however, work overtime.

Punctuality is very important for business occasions in the US. In many U.S. cities, traffic can cause considerable delays, so be sure to allow enough driving time to your appointment. If you know that you will be late, call to let your contact know.

If you are invited for a meal in the USA, you should arrive promptly.

When invited to a cocktail party in the US, it's usually permissible to arrive a few minutes late. On these occasions, you do not need to call ahead, even if you will be 30 minutes late.