So it's performative inclusiveness.
It's not enough just to read books that might have some relevance to the remit of the organization (do they, is that why RIBA is involved with WBD?)
Somehow they have to show they are inclusive, so the reader has to be from an identity group? And the best identity group is drag queens?
I kind of thought being inclusive might mean trying to make sure the venue was accessible to the disabled, or, say, not refusing to admit black/female/gay people. My guess is they already do the latter.
Identity politics is toxic.