Conversation so far:
What is the rating of the movie?
The Calgary Herald gave it a rating of 3/5.
Who are the actor in the movie?
Stiller, Downey, and Black.
When was the release of the movie?
August 2008.
Who produced the film?
CANNOTANSWER.
Who is the director of the film?
CANNOTANSWER.

Question: When was the promotion happened?
Self-contained rewrite: When did the promotion for Tropic Thunder happen?