Wow...that's the saddest thing I've heard all week.
I noticed this was posted in May...any updates?
We offer BJ 3 times a week. Twice at night (huge classes) and 1 in the daytime (much smaller). We even decided to pull the daytime Jam for the summer because it falls on a Sat. afternoon and peeps are doing other things. However, we added a Body Jam for Kids (30 min. format) and it is AWESOME!
Saying that, if you still can, remind your club that Body Jam appeals to all ages. I have high school age to people over 50. You can hang signs that advertise for "Date Night" too. I have several married couples, believe it or not, who leave the kids and come Jam. So damn cool. Someone mentioned posting at high schools, etc. Awesome idea!
Try adding a "Body Jam Breakdown" for 30 min. before class where members can come to learn the base moves of each track. I know that helped a lot when we launched the program. Instructors can stay with releases longer to give members more time to learn and really dance it.
Conside a TGIF BODY JAM PARTY! Shake the stress off from the week, start the weekend off right, maybe a raffle or two, and go somewhere for an off-the-record Happy Hour (optional of course, w/out advertising).
It's all about the PARTY in Body Jam and I truly think how your club sells it will make all the difference in the world.
Hope this helps and best of luck to you! 
Jeni Morrison