Conversation so far:
When was Robin's death?
20 May 2012.
When did they return to performing?
Barry and Robin performed on the BBC's Strictly Come Dancing on 31 October 2009.
What happened in 2009?
appeared on ABC-TV's Dancing with the Stars on 17 November 2009.
What happened in 2010?
On 26 May 2010, the two made a surprise appearance on the ninth-season finale of American Idol.

Question: What happened in 2011?
Self-contained rewrite: What happened in 2011 for the Bee Gees?