As soon as possible after Christmas, call a staff meeting and ask each team member prepare a brief report on a different department of the business and how it performed in the three months to Christmas.
The goal of this exercise to to engage them with data, to see what they come up with. My hope is that their perspective is eye-opening for you, beneficial for your business planning for 2016.
The exercise could also separate those who look at the business through anecdotes compared to those who look at the business through business data. This second group will produce better results for you as data trumps anecdotes every time.