Such a confusing thing isn't it? my B & SIL are getting their little boy babptised Catholic next Sunday and they are only having 2 godparents I think, but they are only inviting family and the friends that are involved as godparents. So there will be about 25 people there. I have been to some that are huge events with heaps of people, so I suppose it jst depends on what you and Dh are happy with. I'm sure no one would be offended if they didn't get invited to the ceremony, but you could just have them for a brunch?