I work at a large non-profit organization that has many divisions, each of which produces different content, from magazines to books to maps to games to television shows. There are about 20 of us editors who get together once a month to talk about language usage across the organization. I'm the chair of the committee of these comma jockeys.
Our December meeting is traditionally a party with treats and eggnog. The invitation I sent out said "Holiday Egg Nog Party." None of the committee members said anything about "egg nog" as two words, but one responded that she couldn't attend "the holiday eggnog party."
That editor was graceful in correcting my error without public embarrassment and egg on my face. That's the best kind of editor you can find.
Maybe I made the error because I don't like eggnog. As a friend said the other day, it's like drinking pancake batter--yum.
"Can I refill your eggnog? Get you something to eat? Drive you out to the middle of nowhere and leave you for dead?" T-shirt available at redbubble.com. (Yes, it's really available on a T-shirt. I can't wait to order one for the holidays.)