Going to Nutikiville meant not being able to accompany Amelia and Henry in Salt City, and staying in Salt City meant not being able to accompany Eric's parents.
Upon hearing that, Sylvia said, "Eric, we should spend New Year's in Nutikiville. For the past two years, we celebrated in Salt City. While it was great for us and our parents here, no place compared to the way they felt about Nutikiville."
This woman was quite astute.
Did Eric's parents really want to spend New Year's in Salt City?