Final answer:
The Vietnam Memorial was completed and dedicated on November 13, 1982, however an exact deadline date for building the memorial is not given due to lack of specific context in the given question.
Step-by-step explanation:
The question does not specifically state which memorial's deadline is being referenced. However, regarding the Vietnam Memorial designed by Maya Lin, it was completed and dedicated on November 13, 1982. Unfortunately, without more context about which memorial deadline the question refers to – whether it's the Holocaust Memorial in San Francisco, the National World War II Memorial in Washington, D.C., or another memorial – I am unable to provide an exact deadline date for building the memorial.