Sorry for the length.
I really feel a relative is deliberately sabotaging arrangements for family gatherings. It happens every year.
The date decided needed to fit in with everyone's plans. I let her know early on in the year what this years available dates were and gave regular reminders. She decided on a date when I don't have my daughter and expected me to get the Ex's family to change their bookings as everyone wanted to see my daughter (according to her anyway). I told her I wasn't going to alter the pre-existing plans that she was fully aware of.
We needed to meet up at a convenient location; their place isn't suitable as some people couldn't travel early enough due to other commitments. They are unable to cater for that many people and don't have the stamina. She get very stressed and has ended up in hospital before. No one could get to their place early enough to help set up because of work and other commitments - she chose a date when she knew no one was available to help.
We arranged to meet up near us as it's the most convenient location for just about everyone and means my daughter could be there for part of it. We arranged free accommodation as they didn't want all the travelling on one day. Then they decided they don't want to stay overnight; they don't want to drive. We arranged a lift there and back.
They aren't ready when the lift arrives to pick them up. They are late for the meal. They criticise the overcooked food (their fault).
A few relatives were unable to attend due to the date chosen. She's now arranged another get together which we are expected to attend at short notice. Yet again it's when my daughter is with her father and there is limited help available - we are just all supposed to drop everything and obey their commands.
Why? What's going on here? We all explain when we are really busy, when we are free and available. What's the purpose of deliberately making things stressful for everyone?