Briefly, No Kidding! "is an all-volunteer, non-profit social club for couples and singles who, for whatever reason, have never had children. It is not a business. No one gets paid for their contribution to the club." (quoted from No Kidding!'s main site)
There is a mailing list for people interested in Toronto No Kidding! You can subscribe at this address. Being subscribed to the list is the only sure-fire way to know what Toronto No Kidding! is up to!! (If you have trouble with the address, you'll need to contact the Yahoo! people directly... I'm afraid I don't know how their system works. :)
To get in touch with the administration of Toronto No Kidding!, contact them at childfree@sympatico.ca. If you are confirming your attendance at a get-together, that should be done on the Yahoo! mailing list described above.
If you wish to write to them directly, you can do that at:
Toronto No Kidding
155 Tycos Drive
Unit 44
Toronto, ON M6B 1W6
Upcoming get-togethers (this page is outside of my website and will open in its own window)