Ask Cynthia Lett of Silver Spring, Md.-based The Lett Group and she'll tell you: Etiquette isn't just for debutantes and diplomats. Her training company, which specializes in delicate business protocol across cultures and industries, now offers its services to event and meeting planners worldwide. Among hot issues are receiving lines, seating plans, proper forms of address and greeting, invitation wording, gift selection and appropriate event entertainment. Call 301/946-8208 for details, or check out the company's Web site, www.lettgroup.com, which includes a list of etiquette “pet peeves,” such as the waiter who turns over the wine glass of a non-drinking guest. Tsk, tsk!