Red Velvet / Comey Tweet Thoughts
Aside from the sexual urban dictionary meaning of Red Velvet, the tweet could be making a more simple reference to blood–found this in a review about Red Velvet.
About Red Velvet
"It's like being at a crossroads - a point of absolute, unequivocal change. It makes the blood rush."
https://www.bloomsbury.com/us/red-velvet-9781408173558/
There's also a more simple interpretation of the tweet, that it might be some sort of signal - it time for "Black Actors to take the stage." The [London's West End] part seems unnecessary to the message of the tweet and probably means something else. (End West) meh
Aldridge took over the role of Othello for a performance in 1833 after the famous Shakespearean actor who was playing the part collapsed and had to be replaced.
Red Velvet is set in the months preceding the vote on the Slavery Abolition Act, passed in August 1833, which eventually ended slavery in most of the British empire.
The play Othello itself is rich in symbolism and intrigue. The Full title of the play is The Tragedy of Othello, the Moor of Venice.
The central plot/conflict of the story revolves around Othello (a Moorish general in the Venetian army) and his unfaithful ensign, Iago.
For the Trump RussiaGate symbolism, Iago might be an important reference. Iago manipulates all other characters at will, controlling their movements and trapping them in an intricate net of lies. He achieves this by getting close to all characters and playing on their weaknesses while they refer to him as "honest" Iago, thus furthering his control over the characters.
(wiki)
Pick your own rabbit hole.