A few tips for everyone that may or not be in etiquette books somewhere:
1. If you get an online or invitation, whether it be facebook or evite, RESPOND!
2. At direct sales parties, don’t tell the hostess you’re going to order something later or online if you’re not. It just gets their hopes up. (Consultants know that most of the time, you’re not.)
3. If someone calls you and leaves a message, call them back in a reasonable amount of time (I’m the worst about this, but making a concerted effort about being better).
4. Be respectful of people’s time (don’t be late)!