Conversation so far:
What is the rating of the movie Tropic Thunder?
Tropic Thunder is rated R.
Who are the actors in the movie Tropic Thunder?
Ben Stiller, Jack Black, and Robert Downey Jr. are the actors in Tropic Thunder.
When was the release of the movie Tropic Thunder?
Tropic Thunder was released on August 13, 2008.
Who produced Tropic Thunder?
Tropic Thunder was an international co-production between the US,UK, and Germany produced by Stuart Cornfeld, Stiller, and Eric McLeod for Red Hour Productions and DreamWorks Pictures.
Who is the director of Tropic Thunder?
Ben Stiller is the director of Tropic Thunder.

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