Yeah, I don't do any Mardi Gras stuff. I do think it's funny that you decorate for Halloween, on Halloween.
Yes, I'm always running around hastily putting it up as I see trick-or-treaters coming down the street!
When my kids were little, I was much more elaborate. We carved pumpkins, hung that spider web stuff on the porch, hung ghosts on a tree the kids made by pulling pieces of sheet over Styrofoam balls and drawing on faces with Sharpies, constructed a scarecrow with old clothes, leaves and a scary plastic mask. My remaining Halloween decor dates back to those days.
As for Mardi Gras, I do it as a tribute to my time of living in New Orleans.