Flip the door hinges so it swings inward and mount to small handholds on the back of the wood panel and you should be able to pull it into the little clamps from the inside. That should work to be able to get everyone inside and keep up the hidden appearance I am thinking.
Flip the door hinges so it swings inward and mount to small handholds on the back of the wood panel and you should be able to pull it into the little clamps from the inside. That should work to be able to get everyone inside and keep up the hidden appearance I am thinking.