Not feeling festive? Don’t force it. However you’re feeling is however you should be feeling. This year, it is particularly easy not to feel festive, since so far there's no snow and little feeling of winter. It's tough to feel Christmas-y when it's 58 degree outside!
So - do what you need to do, but don't force those festive feelings. On the other hand, if, out of the blue, you do start feeling festive, go with the flow!