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…