Today's BWOTD is a popular phrase:
"The whole place was chock-a-block"
'Chock-a-block' = closely packed together
This is nearly always used to describe a place or situation as being packed tight with things or people. It is believed the origin comes from our maritime history, and refers to when a block and tackle were jammed against each other to stop the load moving on a ship.
It also often abbreviated to just 'chocka'.