I had a baby shower last week and it was lovely. I organised it myself and it was a great opportunity for the girls to get together at my house and spend the evening coo-ing over baby grows and laughing at a baby name book.
I bought plain white baby grows and fabric pens and we all made baby grows for the baby, I made an anagram game of pregnancy symptoms and we played symptom bingo (this was very funny). We also talked about baby names, family traditions, shared birth stories etc.
It isn't everyone's cup of tea but those who came had a lovely time. If you don't like that kind of thing, don't go.
I worked full time right up until the very end of my pregnancy (baby shower Monday, birth on Sat!) so it was a lovey chance to sit down and actually enjoy being pregnant and talk about the baby with all my friends.
I had terrible PND with both my previous two which I associate with not taking the time to mark the end of 'working me' and the start of 'mummy me'. It was a really positive, bonding experience.
I got a few funny looks because it was my third pregnancy but I did it anyway so you should go for it if it will make you happy. Pregnancy is a special thing and it's pretty sad if you're not allowed to celebrate it.
If your mum isn't going to get into the spirit of it then do it without her.
I changed my name after the birth of my second child (4 years after the wedding) at a time that felt right for me.
Your body: your pregnancy: your party: your choice
Your name: your identity: your choice
YANBU
Have a lovely wedding and baby shower