I am the organizer of a logic reading group at the Graduate Center. We are currently working on set theory.
The book we are reading is:
Set Theory and the Continuum Problem (Dover Books on Mathematics)
Authors: Smullyan, Raymond M.; Fitting, Melvin
Publisher: Dover Publications
Published: 2010
Meetings are on Friday at the Philosophy Department of the Graduate Center.
If you are interested, drop me an email.