Beavers are in the middle of a massive loop of newspaper/lining paper and have to coordinate themselves to walk - kind of like caterpillar tracks on a tank.
Lining paper or newspaper.
Make a loop big enough for your lodge to stand inside the loop and hold the top of it over their heads.
Get everyone in the lodge standing in the loop of paper, holding the top of it over their heads.
They then have to walk forwards (as a race?) by feeding the back of the loop over their heads to give them a place to walk.