A function/show was arranged to display what was supposed to be the blessed Hair of Rasulullah (Sallallahu alayhi wasallam).

Answer

Do not attend the functions which the Bid'atis organize. We do not know if the hair they are displaying is authentic or not. There are many genuine mubaarak Hairs of our Nabi (Sallallahu alayhi wasallam) in the possession of many people. Rasulullah (Sallallahu alayhi wasallam) had distributed his hairs to numerous Sahaabah, and such Hairs were passed from generation to generation. Assuming that the Hairs displayed by the Qabar Puja sect are genuine, then too it is not permissible to attend their functions where they indulge in bid'ah practices.