Here's the board, just outside his room, in the hallway that has become the playroom - we can raise the board later when he's taller:
Here's the other side of the hallway - not tot trays per se, but many of Acorn's toys are on the shelves here, for him to get out when he wants:
Here are the dozens of calendar elements I've laminated by hand.
Here's the calendar setup:
And here's the work box of activities for Acorn to work on: