How do I organize this family get together when there are disagreements?

There is this thing. a cousin of my mother who is a super senior citizen but still sane and travels and walks, she is very close to the rest of my mom sisters and my mom sisters children (which means me and my cousins). This senior cousin out of the blue one of this days texted me and told me that why I and my brother dont organize like an activity at a small BBQ place my mom, my sister, my brotehr and me own in some rural city (not so long anyway), this property is a place inherited by our late dad. The place has a small BBQ place, a garden where cars can park, and a restroom, jsut the basics.

I mean I will be glad to organize something but first my brother and I have to go and clean up, mow the lawn and do other stuff there in order for the place to be ready to start scheduling a time and date. Anyway this cousin wants me to invite her cousins (who are 7 my 7 aunts) and some of my aunts children (my cousins and theri respective partners the ones who have partners and also theri kids, not so kids anymore).

The thing is that between some (not all) aunts there had been some disagreements due to some family issues that started in the past so many years ago and still are resented but also beause they have difficult temper. The problem is between 2 aunts, (2 sisters) who unfortunately dragged their respective adult kids to the problems and they do not even like to get to talk to their own aunts or even see them personally in family activities, anymore and this started just like 12 years ago they dont want to talk anymore to each other To the extent that if there is a family gathering if one goes the other does not go and viceversa and also their kids..

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Anyway this senior cousin of course is not aware of those disagreements of their own cousins, I means she does nto need to know anyway and when she told me to organize the thing in the BBQ place she told me to invite all her cousins, because she does get along with her cousins.

So how to invite my aunts if some won't attend and what excuse do I give the my aunts cousin that soem of her own cousin won't be there? She may wonder why some will attend and not the others or should I tell her the tru
How do I organize this family get together when there are disagreements?
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