Conversation so far:
When was Ritual Spirit EP released?
28 January 2016
What was the result of the Ritual Spirit EP release?
On 29 July 2016, they released a new single, The Spoils
Did the spoils win any awards?
What happened after the release of the spoils?
The video for The Spoils, featuring Cate Blanchett, and directed by Australian director John Hillcoat, was released on 9 August 2016
Was the music video for the spoils successful?
What was the return of Tricky?
Del Naja confirmed that not only was new Massive Attack material in the works, but that rumours of a reunion with Tricky were true.

Question: When did this take place?
Self-contained rewrite: When did the return of tricky take place?