Congratulations, Bill! What a boost for your series!

I'll let others suggest their favorite vieos with teen dancers.

They might enjoy watching the series of instructional videos produced by dancers
in Atlanta. This one, for example, covers two-person moves, and the section on
swinging begins at about 3:00. Granted, they're not teen dancers, but the
step-by-step review of basics might be helpful.

You can find an index of all the dances in the series, as well as videos of a
live session for beginners:

http://www.contradance.org/html/new_dancer_info.php#video

in this one, the swing is taught starting at about 3:40.

In both videos, the instructors stress how to end a swing, with the lady on the
right.

And given the high energy level and the lack of experience, don't feel you need
to call a contras only program. Your regular dancers might also enjoy a barn
dance, high energy and lots of fun, perhaps one that you haven't used often, or
a lively and simple square that's suitable for everyone. The key, I think, to
keeping the younger dancers coming back is not a lot of instruction but keeping
a light tone and making the dance a fun place for them to be with their friends.
If they're having fun, they'll keep coming back, and in time most of them will
pick up somewhat smoother style than the grasshopper up and down bouncing that
probably characterizes their movement at the moment. 

Dances with a sashay are fun for high-energy dancers, and your older folks who
don't want to sashay could just walk down and back. Similarly, newcomers like to
clap, so give them a dance where there's clapping at a specified part of the
dance. (In a barn dance type of longways dance, this can happen spontaneously as
the top coupls gallops down to the bottom of the set at the end of a time
through the dance.) But in a contra or Sicilian circle, this encourages them to
listen to the tune to find those places, and the clapping at that right spot is
positive reinforcement. 

So, with the numbers you're talking about, a simple dance such as Haste to the
Wedding can be done as a Sicilian circle, can give them practice in ending a
swing properly and in the progression AND it has clapping at a specified place.
Furthermore, if you end up with 32 teens, your sicilian circle will have eight
sets of four couples, enough to run the dance for everyone to go all the way
around the circle and to meet up once again with their original neighbors, which
inevitably produces a whoop of astonishment and satisfaction.

David Millstone
Lebanon, NH