Oh happy day...

We walk past a house just as a funny little woman is making her exit. I think I overhear her say to those still inside, "Happy Bowling Day." Sounds a little bit weird, I think, and laugh out loud and ask M if she heard it. "Yes," says M, "Happy Floor Laying Day." M, after I've given it a few seconds thought, is obviously right (she usually is!). We ponder whether the people inside are simply sprawled in the horizontal on the floor or are going to be spending the day ahead fitting a carpet, parquet blocks, laminate or some other floor covering. We also wonder if Floor Laying Day is a national holiday we've not been told about. Are you laying a floor today? Are you celebrating same? Please advise.