For some context I have been playing musical instruments since I was around 7 years old in some capacity, ranging from the piano and singing, to the clarinet and saxophone.
We moved house around two years ago, and at the time we had horrible neighbours. At the time, I was having a hiatus from music due to studying. Ever since we got new neighbours roughly 6 months ago, my father implemented a "no practising" rule in the house. His reasoning was that we shouldn't annoy our nice new neighbours, so I was told to "figure something out" for my practise. He is very stubborn and set in his ways, so I didn't raise the issue.
This was all fine, as I could practise at my boyfriend's house occasionally and I was just having lessons for fun. However, my saxophone teacher has told me that we are going to start studying for grade 8 and he wants me to perform two of my pieces for the exam in a concert at Christmas. This was also fine, until he told me today that he wants me to know the pieces by heart.
I have a lot of difficulty learning things from memory, so I now know I need to do at least twice the amount of practice I was planning on doing. The problem is now that I can't do that level of practice at my boyfriend's because I'm not there enough and obviously I don't want to spend all my time working and ignoring him. Also, my school doesn't have a music department as it is exclusively a STEM school specialising in computer science, maths and traditional science.
TL;DR I need a way to talk to my father about revoking the rule against practising in the house, or I'm going to humiliate myself in the concert and let down my teacher. Please bear in mind that he is not the best listener and can be unreasonable when it comes to taking suggestions.
Update I went around my father and spoke to the neighbours who said I can practice anytime I like. I then presented this information to my father and it went fine. Thanks for all the advice you gave in handling this situation diplomatically.