The good news: I can pass my front hallway again. I cleared a chunk of the dining room floor, slid the plywood out of the hall and put it in the floor so that it bows up in the middle, then stacked the stuff that had been on the floor onto the plywood hoping that the weight would flatten the wood a little over time. I even stuck my big bass amp there (it should go upstairs to the music room, but until I need it there, it's serving as a weight. That did not press the wood flat. Oops. I could do it with boxes of books from the basement, but that seems too much trouble at the moment. (Doh! The two boxes of LPs are near there and could be moved onto the plywood easily. I'll do that later.)
Even if this doesn't de-warp the plywood, until I get my house organized enough to be ready to use the dining room as a dining room, the plywood is less in my way under a pile of stuff than blocking the hall. I just need to make sure I don't render it too difficult to extract between now and next Pennsic.
The bad news: Ow! This was pobably not the best day to do that painwise, but I had a burst of energy and was really frustrated at the obstruction. Ow.
And I, for one, am smiling
Good