I'm planning a joint birthday party and christening for my two children. It will be a christening followed by an after party where I will also invite my children's friends to just the party bit. Should I inform the parents of those I'm inviting to just the party that's it's also joint with christening? I'm just thinking if I turned up to something like that I'd wonder why most people there were dressed up smart I.e. From the christening. Or am I over thinking this?