I heard about this new initiative [in the States] to have shadchanim work at weddings making shidduchim right then and there [i.e. setting up meetings] between the people on the opposite sides of the mechitza. Someone cynically suggested that they also have people selling life insurance at funerals. Hey - this is a time to make sure that your family will be taken care of after you go!! Meaning, that a wedding is a time to be משמח חתן וכלה and not to think about yourself.
But IF the chosson and kalla are in favor AND if this is done when the chosson and kallah are not in the room [such as when they are in the yichud room (and then pictures) which lasts longer than some actual marriages] so the attention is not diverted from them - it seems like a great idea [which has been approved by rabbonim as not breaching tzniyus].
So please - MAKE A SHIDDUCH TODAY!!! There are sooooo many people out there who are alone and "it is not good for man to be alone" - לא טוב היות האדם לבדו!!