OP here, I guess I need to clarify a few things. First of all, this is DSis's younger daughter, her older daughter made her 1st Communion two years ago on a Saturday, furthering my assumption that the first weekend in May meant the 7th and 8th. This year's ceremony is also on Saturday, and although there is also the possibility that my goddaughter could make her 1st Communion on Sunday, my sister has decided to dig in her heels and celebrate on Saturday. My BIL's family lives in Michigan so they will be there on Saturday.
My parents were not sure about travelling to Michigan in any case. My dad has had some medical issues which have caused the rest of us to limit his driving (no driving at night). I had suggested that my parents ride with us but if my sister is insisting on a Saturday 1st Communion, I don't see how that will work. We would have to drive to Michigan early Saturday morning, stay for an hour or two, then turn right around to get back for the Saturday night performance (and the concert).
This changes things. If sister has the option to change, and won't, then she is risking her daughter's happiness for stubborn pride? I'm not sure what else to think...?
That event is very important, but to not change the date in order to accommodate everyone, speaks to greater issues.
At this point, I think it might be wise to take step back, and leave it be for a few days, so that sis can calm down a bit. She needs to be more realistic to the fact that she messed up big time, and since she has the opportunity to fix it, and won't, this is very immature of her.
I so hope you find an equitable solution, but considering this new info, it seems that your niece/goddaughter is going to suffer due to the immaturity and miscommunications of the adults in her life, the biggest of which is her mom.
I can totally understand as my sister is like this (we live in the same city, just a few minutes from each other) - the exact opposite of me: not a planner, doesn't send out invites, constantly changes dates, expects people to drop things to attend events in a few hours, etc. It has made for some serious issues, of which I have always stood my ground that the children should never be made to pay for the flakiness, irresponsibility or immaturity of the adults in their lives, and we have usually been able to work things out. Although a few times, she has expected me to cancel events (well your nieces are always more important than xxx), and we've had major blow outs about her irresponsibility in properly notifying people. She has improved a bit, due to some big arguments on our end. Hopefully, your niece's special day doesn't result in that.
Tiger