DB and FS have only collaborated on the project "Here Lies Love". From the Wikipedia for the collaboration, it seems to be an album that was adapted into a musical, and the album features 20 vocalists, and DB and FS weren't participants in the muscal. The Wiki states that there were a couple performances of the album but doesn't specify anything about both of them performing together, and I couldn't find anything else about the performing together either. In the absence of any evidence to the contrary, I think think the act is inevitable.
8.11/japanese breakfast 8.21/dead & co 9.2-5/bonnaroo 10.1/big thief 10.16/all things go 12.1/caribou 2.19/avalanches 2.26/clairo & arlo parks 3.5.22/circa survive 3.16.22/bad bunny 4.22-24.22/coachella w2
21/12 - Elton John 31/01 - Fatboy Slim 16/02 - Fire Fight Australia (Queen, Alice Cooper, Daryl Braithwaite, Olivia Newton-John, Peking Duk, etc.) 24/03 - The National (happy birthday to meeeee!) 16/04 - Patti Smith damn bats.