Did they seriously have a baby monitor on the list? The absolute neck of that!
I had one in my mum's house and we put on a very extravagant spread; my mum paid for most of the food and cakes and I prepared loads of nice salads to go with it and did jugs of virgin and alcohol cocktails. My two friends who organised it sent me away for an hour while they decorated the garden and got it all ready. It was fab, I don't think I could have enjoyed it more.
Coming up to the shower most of my mum friends contacted me with questions like "do you want my breast pump / baby bath?" and three grouped together to buy me a bag. I did get some new gifts but it was things like a packet of bibs or nappies. Did you not have these choices on your list?
I see the shower as a lovely way for women to come together, share their recommendations with mum to be and have a laugh.
None of my friends are short on money particularly but everyone always passed on stuff if it was still good. At some point it would wear out , then you'd buy a new version and pass it on to the next person. I know not all groups operate like this but it did feel nice to be part of.
Any other showers I went to were very similar and lots of fun. It's basically a leisurely lunch in somebody's house, some specified being a cake or a salad plus a gift.
I have been invited to a few similar to what you described but they weren't remotely close friends and I recoiled at the gift list for a person I barely knew and declined.
I had a strange experience once, not CF territory but kind of odd communication; our friend Hayley got married and I went along as part of a friend group of 8 to her hen party where we met her two oldest friends the bridesmaids (who refused to speak to each other) Sarah and Kathryn. That was the total hen party. It was brilliant fun and we got on fine with the two bridesmaids, only seeing them once more at the wedding.
Hayley announced her pregnancy a year later then six months later Sarah contacted only three of us saying she wanted to spoil mum to be and was taking her to a very expensive spa for a massage etc then they'd be having afternoon tea. She said she knew Hayley would love if we dropped when they were having the afternoon tea.
We all live in very expensive city and this was our most upmarket 5* hotel. I lived nearby and often came in for a coffee. Two of said we would love to and arrived in. Hayley was thrilled to see us as Sarah predicted. Good vibes all round.
Then this is where it got weird. Sarah summoned over the waiter and started offering us stuff "what do you mean you're just having coffee, you will have the afternoon tea, it's spectacular, ok one between you both then but (with a wink at the waiter) make them champagne ones bring an extra champagne and we will order a separate chicken sandwich because it's the best part of the tea" etc etc.
So she never said "this is my treat" but had certainly assumed the role of host. Of course you know how the story ends; we all got presented with the bill and an assumption we would split it including Hayley's. Like fools we just beamed and said thank you so much for including us, let me get my card then straight out the door to a reasonable priced pub, ordered drinks then turned red-faced to each other with one of us (can't remember who) saying "I'm so embarrassed, I thought we were being treated and I really couldn't afford it".