Although I have dropped out of the play, I have checked in with several fellow patients who continue on, asking them for updates.
Many of the roles, if not all, are now cast.

The casting has now been slightly opened up, and the gradual inclusion process interests me.
In the first stage of casting,
the drama director casts current clinic patients.

When the director opens up from the first to the second phase,
the casting of roles draws on participants
who are not only from the current population of in-patient residents,
but those participants who are former patients from the clinic,
now discharged, and who have worked in past plays produced by the clinic's activities department.

Thus, when I asked after characters in 'Midsummer Night's Dream,' role by role, and got updated reports from my fellow patients,
they named not only people I recognize from the resident in-patient population
but also people from before my time,
who completed their in-patient treatment, were discharged,
and are either in aftercare
or are clinic 'alumnae'.

A later stage of casting will open up and out to
include community members otherwise not connected with the clinic.

I note that Bottom and his "Athenian mechanicals", who
stage a play-within-a-play that is ridiculously amateurish
(Shakespeare no doubt getting some dismaying real-life experiences out of his system),
are largely present-day residential patients,
some of them real drama queens in life outside the theater.
The result ought to be uproarious.