why not do some investigative journalism. select 10 random imambargahs, have some volunteers visit them. its a known date (10th muharram), and you just need to turn up in a shalwar qamiz and have a mobile phone on you that can record the orgy.
i have done that, been there for nearly 2 whole months(right from first muharram to ashoora, shaam-e-ghareebaan, the twentieth, arbaeen and the last two weeks) and know for sure nothing like that happens…
Have you guys heard of the hadees that its enough for a Muslim to become a liar is that he/she forwards a news without confirming ..
and this is not just a lie, this also comes under gheebat.
I dont care if you have problem with shia'ism - but spreading a rumor that they conduct that hideous sexual act on that night .. astaghfarullah .. people go their with their mothers and sisters and daughters -