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.
Where did they do the routine at?
Despite an initial rocky start, the act was a success, and brought them more theater dates throughout Canada.

Question: When did they do this?
Self-contained rewrite: When did Skelton and Edna start their act?