First they came after their bikes, then they came to prohibit boys playing ball and even swimming, then they came after their phones and then the internet. Now they are against a family sitting together at a kosher concert, and read below how in a world gone absolutely mad they were able to convince  R' Chaim Kanievski to write a letter to "admonish" those organizing these concerts. 
These insane parasites don't care if the boys get bored to tears, they want them sitting home doing nothing. 
There actually wasn't any "mixed dancing" at all ... 
there were some boys dancing in their seats next to some seminary girls also dancing in their seats.. 
Wow... Hey maybe that would solve the Shidduch crises? 
 Mordechai Shapiro knowing whats good for him caved like a cheap cardboard box, whimpering like a sick puppy that he "wasn't aware of the "mixed dancing". 
I think that the IDF should draft the "Extremists" for a couple of months.
Read and cry!
A musical concert which took place at Jerusalem’s Binyanei Haumah conference center Monday night has raised an uproar in the chareidi community after scenes emerged of chareidi men and women dancing adjacent to one another.
In the past, the gedolim have warned that such musical events can lead to a serious spiritual deterioration if they are not conducted in a kosher manner and with proper decorum. Last week, during the course of the Tzam’ah concerts which take place annually to celebrate the 19th of Kislev, the gedolim protested the fact that male singers sing at a concert for women only and the women dance during the course of the concerts.
However the concert on Monday which starred American chareidi singer Mordechai Shapira was a far more serious breach of rules, as the concert featured mixed seating and at various points men and women were dancing adjacent to one another. The concert was touted for the chareidi community and advertising in various chareidi journals and communities but the atmosphere was inappropriate.Various rabbis decried the frivolous atmosphere and one educator remarked that “as a result of the mixed seating things deteriorated to singing and dancing together. Even in the US where they are more open there are no such things. Even those singers who used to appear before mixed audiences don’t so so any more.”
Another educator criticized the “disgraceful scene” in which “yeshiva students were seen dancing next to sem girls as a chareidi singer performs is a terrible breach of rules and weakening of the chareidi fight for purity in our camp. At this rate the youth will soon question why we need to hold weddings and events with separation.”
Last week Rabbi Chaim Kanievski wrote a letter stating that “recently people who violate  rules have begun to entice yeshiva students to all kinds of song evenings under the guise of raising spirits through music and song. When these are conducted without spiritual supervision the atmosphere is far from spiritual strengthening and is more entertainment and lapsing which can cause spiritual damage and wasting time from Torah study.
Rabbi Kanievski compared these evenings to a Moshav Leitzim, a place where mockers of Torah congregate.”