With the Exception of the Sride Aish teshuvot. On which psaks do mixed youth groups rely apon? Todah and skoiach
Since the time of the Sridei Aish, all of the rabbanim that have permitted in their communities participation in mixed youth movements like Bnei Akiva have relied on his psak, not only as a halachic precedent, but also because they have accepted the validity of the considerations he cites. Harav Uziel in Piskei Uziel 44 permits men and women to participate together in serious gatherings without assuming that this automatically infringes on the laws of tzniut.