Conversation so far:
Who left Vampire Weekend?
It was revealed on January 26, 2016 that Rostam Batmanglij had departed from Vampire Weekend.
Why did Batmanglij leave Vampire Weekend?
Batmanglij announced on Twitter that he had left Vampire Weekend to pursue solo projects.
What did Batmanglij want?
What did Batmanglij move onto from Vampire Weekend?
Batmangkij moved onto solo projects after leaving Vampire Weekend.
When was it released?
What did Vampire Weekend do?
Vampire Weekend briefly performed at a rally for presidential candidate Bernie Sanders in Washington Square Park.

Question: What date was it
Self-contained rewrite: What date was the Vampire Weekend performance at the preidential rally for Bernie Sanders?