We shouldn't forget that the concept of Advent was created to encourage not only the remembering of Christ's first coming, but the looking forward to His return--and that's an attitude that can come naturally in any season. Now, I don't endorse the obsession with an imminent Parousia (if indeed it is imminent) that consumes many believers to the point that their whole concept of "God's work" seems to be harping on the sorry state of this world. But probably as many go to the opposite extreme and live for worldly success while treating God only as a source of material blessing. What He wants is for us to work hard under His guidance to make this world more like His future Kingdom, while maintaining a humble yet eager awareness that only He will bring it in fullness and permanence.
That's the way Jesus Himself lived--making the Kingdom a present as well as a future reality.