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When my brother got married, our mother took off at the last minute to do some shopping. This was in a town new to all of us, so we were afraid she would get lost, which would put a significant damper on the wedding (if it were an ephisode of "Friends" it would be titled "The one where the Groom's mom didn't show").
At the time I felt that I had "lost contol". Since then, though, I've been involved in a 12 step group and from that, I've learned that in fact I never had control in the first place.
So if I had to do it over again, I'd relax and let it be, maybe, "The one where the Groom's mom didn't show". It's just a suggestion to the LW, but learning to just let it be the one where the Father's siblings don't make it due to some wheelchair logistics, or the one where they get mad at you because you say no, you can't stay at my house - well, it's an option.
I've found it to be a good option, myself.
I've no idea if you're Christian enough for a Christening. Sorry on that point. I promise to be more judgemental in the future.
Good luck.