Mom wants me to change my wedding date due to her having concert tickets the same day

UPDATE: Thank you for all of the responses and reading my dramatic saga 😩😅 I told them this morning that I’m keeping the date in January that I picked. Haven’t heard anything back from them yet…

Original post:

Long story short, I was planning to have my wedding in November but due to my family urging me to push it back & me wanting more time to plan, I moved it to January. I picked a specific weekend in January bc some of my family who lives across the country will already be here on that weekend. My whole family agreed to the date and my venue accommodated the change. This was a week ago. Today my mom and sister tell me they remembered they have a concert to go to on the day in January I picked, so they need me to move it back a weekend. Note their concert tickets are able to be sold and they can pick a different day to go, the show is planing at the same theater all winter. I don’t want to move the wedding back, bc then my family member who lives cross country will have to fly home the weekend before, and fly back out just for my wedding. I also have been going back and forth with my wedding planner and just don’t want to move it again- this would be the 3rd time in 1 month.

My mom & sister called me on a 3-way call tonight and told me I’m being so selfish, rude, and lots of other nasty things. It was like an hour long call and my fiancé overheard so although they tried to gaslight me (again) I had a witness to what they said.

In the end I agreed to ask the venue if they can move the wedding back a week. But I really don’t want to, esp because their tickets are changeable!!! My question is, am I wrong to not want to change it? Is a concert ticket really that serious that you can’t change it for a wedding?