"why not have 1 wedding ceremony and 2 receptions?"
I Am Me's remedy sounds best so far. Nevertheless, if that weren't a viable option, there's no way in hell I'll let my mummy or my significant other's mummy have it here. I don't care whether it's a Black, White, Asian, Aboriginal, Orange, Purple, you name it family.
As fas as joy is concerned, culture is irrelevant in this particular matter. What we have amidst us is a case of what constitutes happiness and the purpose of traditions in wedding.
For me, if I go all the way to wed someone, I believe our happiness must also be contained in the celebration. For me, I find happiness in a few, not many. I like close kind of celebration, where people who really mean much to me will be the ones right by my side. We share our times and have an intimate moment. I do not believe in big wedding/party. However, if that is happiness as the brides and bridegrooms define it, I have no problems.
In this case, nonetheless, it is quite to the contrary. The soon to be newly weds have indicated their preferences. They should not have to live the life of a mother/in-law. Under no circumstance should her dreams be fulfilled at someone else's expense. She had the chance to live it up to her dreams, now it is her son's.
Again, the best I would say is what I Am Me suggested: Have a reception for both, where one is intimate and the other is not.
Gosh! There's another reason to keep mother-inlaws from the men's side distant. :| 🙁 I guess that's why I appreciate mother-inlaws who know their boundaries and respect their in-laws.