First of all I would like to ask you if you were sure that the cermony you were talking about was for Qatareis or not?
Second I want to clarify that at present-days if you see someone wearing Qatari national dress(men or women)dose not meen that they are Qataries,every body is copying us in every thing in doha.
Theird and last I don't want you or anyone to forget that there is something called culture diffirance & multi-culture wariness.We have traveled to many places where we have seen many strange things but we respected others culture & religion as well.

Super7 said"what men parties are for, to be honest" this is because in Islam one of the marriage rule
is "Proclamation" you have to invite your friend and neighbor to your widding so others will hear that you have got married.even a smale cermony will do.
I'm ready to answer any quistion regarding any thing about My country Qatar.
I hope everyone enjoy plesent stay in Qatar and enjoies every second passes here in one of the safest countrie in the word.
Regards