This is from the NewYork Cycle Club ride listing. If you live in the area & own a tandem, you are invited to participate. Helmets are required.

Here's the info:

Sunday, December 4
B17 40 miles 10:00 AM
fixed bent tandem ride!

From: George Washington Bridge, NJ side bike path entrance
Show up with your beloved fixed gear, singlespeed, tandem,
recumbent, tricycle, unicycle, or any other human powered wheeled
machine - except a regular old geared bike! We'll take a mostly flat
route to Nyack, where we'll stop at the Runcible for snacks.
Snow, ice, or heavy rain will cancel. Light rain or cold weather
won't. Please check the message board if in doubt.