Epis,
If you’re wondering how to make it so that your friend does not have mixed dancing at his wedding, here is what you should do:
1. Ask your friend for the guest list. Call everyone on the list and warn them that there will be mixed dancing and that if they participate, they will be in violation of a severe issur.
2. Get to the wedding hall early, erect a mechitzah and put up signs indicating which side is the mens’ side and which is the womens’.
3. When people arrive and begin to disregard your efforts, make a scene. Physically stand in the way when men and women begin to dance. Shout and scream over the music. Perhaps even try to physically separate the couples.
When all this is done, you will no longer have the problem of having a friend with mixed dancing by his wedding. Instead, you will have an ex-friend with mixed dancing by his wedding.
The Wolf