Last year I was contacted to perform eight hours away at a family friendly festival this summer. Because of our family business my husband and I can't usually take trips at the same time it's difficult and too expensive to have holidays away together. My mother lives near this festival so I asked if she wanted to meet me and my daughter there for a holiday and I negotiated extra nights accomodation in a family room when she confirmed. I checked again last month if she was still available and was looking forward to it.
Yesterday she messaged saying she forgot she had agreed to go on a trip with one of her female friends and could no longer go. I feel really let down as we'd been telling our daughter about the trip and we were planning to stay at my mum's for a week before- a much needed break away for me too. I can't take my daughter now as there'll be noone to watch her so I find myself tied into playing a festival ages away alone (I wouldn't have agreed had we not planned it as a family trip together) and I am out of pocket as some of my fee was negotiated (deducted) for the larger room and extra nights. I also have used up annual leave to attend as I also have a day job.
My mother won't cancel the trip to another UK city with her friend because "she's already paid" AIBU to ask her to shoulder the difference in pay due to the accommodation booking that is no longer needed?