Well, when I was a kid, we always opened gifts on Christmas Eve and spent Christmas Day at my grandmother's. After my hubby and I had kids, I knew that Christmas Day was spent HERE, at our house, with our family, opening gifts, hanging out, having dinner. NOT ripping presents open then dragging the kids away from all their presents to spend the day at someone else's house. Just always felt that Christmas DAY was for MY FAMILY.
Tree goes up mid-December, whatever weekend falls in the middle - as LONG as it's up before Sarah comes home from college on break. Comes down the weekend around my hubby's b/day, Jan. 8th.
So since 1973, we go to my mother-in-law's on Christmas Eve, noonish and spend the day with 5 or 6 of his siblings and their families. BIG, BUSY day. Then Christmas morning we do stockings, then go to Mass, come home and open gifts and have a great day together, my mom comes over (Dad died 28 years ago) and my single sister. Just the 6 of us.
As the kids have grown up, it's a little different. Brian's 28 & Sarah's 21 now. She doesn't wake us at 4 AM on Christmas morning any more, we have to WAKE her! And believe me, we've paid her back many times over, the first couple years she was in college, we set our alarm and went into her room at 4am going, "Sarah, Sarah...wake up, go peek and see if Santa's been here, we don't want to scare him away!" (which is what she did to her brother for countless years!)
We still leave cookies and milk and a carrot for Rudolph on the table. Sarah insists! Brian has his own house now, and he and his g/f spend most of Xmas Eve with us and half of Christmas Day. He comes about 15 minutes before it's time to leave for Mass!
Oooh. And I went to a real tree 2 Christmases ago. Much to Sarah's DISAPPOINTMENT. We had a 7 1/2 foot HUGE artificial tree that was laden with lights, ribbons and ornaments. First year I put the real tree up, it was a smaller tree, a little stragglier than a full fake tree, and it wouldn't support ALL the dozens of boxes of ornaments and beads etc etc that normally goes on. Sarah walked in the door about 8pm, after a 5 hour drive and a week of hellish finals. Looked at the tree, said, "What the hell is that?"

Oops.
So our traditions are pretty traditional actually. But they're ours!