As important as the birth of Jesus is, it is not the whole story. Without his death, resurrection, and ascension, we would still be lost in our sins.
In advent, we should remember the whole story--everything that Jesus did for our salvation. With the help of the Holy Spirit, which Jesus sent us in Pentecost, we should tell the whole story of Jesus to those around us. Finally, we should look forward to the final chapter of the story, when Jesus will return in glory, to make all things new.