SigMa presents Educational Demos the first Saturday of the month at 5pm on the second floor of the Green Lantern. Upcoming Demos: Saturday, November 2nd: Chastity We will be hosting a couple of guys into chastity who will show off their devices (and others) as well as talk about what interests them in chastity. Additionally, we’ll have a keyholder who will discuss what he gets out of holding the key for his boy/slave. Please join us on the second floor of the Green Lantern on November 2nd for this interesting educational demo.