Conversation so far:
What is the Doughnut Dunkers?
she and Skelton observed the other patrons eating doughnuts and drinking coffee.
They devised the "Doughnut Dunkers" routine.
Who is Red Skelton's female partner?
Skelton and Edna worked for a year in Camden, New Jersey.

Question: Where did they do the routine at?
Self-contained rewrite: Where did Skelton and Edna do the routine at?