I was at a wedding on a Friday and I really didn't notice a difference. If they know the date ahead of time they can get off work to make it and the good part is they still have their entire weekend open afterward. Worst case scenario - some
people miss the ceremony and make it to the reception if they can't get off work or you have fewer guests which is a little nicer to your wallet.
we just WANTED a friday. We enjoyed our weekend mini-moon and he went back to work. He's saving that vacation time for the 'big' trip.Nearly everyone we invited showed up and had a ball! Don't change it!