Looking for plus size ladies ball gowns

Hi everyone,
Myself and my fiancé are hoping to get married on my late dad's birthday in August 2028 and I am looking for plus size ball gown style dresses.
I'm a size 24 and I'm 5'1.We're also hoping to find wheelchair friendly venues for our wedding and reception as our middle niece was diagnosed with global development delay when she was 2 years old.She can walk around unattended as well as saying a few short sentences, but she still uses her wheelchair for long distances or for when she goes on school trips with her SEND school We live in Warrington, Cheshire and I have tried looking for wheelchair and budget friendly venues, but I haven't found any where yet.Has anyone found any budget, child and wheelchair friendly venues on Hitched?