Our traditions are holiday related and they don't happen every year as much as we try. We have managed to at least do PJs on Christmas Eve for 3 years running now!
Our main family tradition for the 3 of us is survival. Survive yet another move. Survive yet another TDY where DH is gone. Survive what is starting to feel like DH's never ending training.
We're not always together for holidays or even every Sunday. We don't always know where we'll be living in a 6 months, let alone a year, to plan out trips.