My eldest has a June birthday so we had a nice garden tea party for him with lots of balloons and literally like 3 presents and not much else just friends and family (coming in and out all day - it felt like a rotisserie of people who wanted to see him and spend time with him on the actual day

). He was so overwhelmed all day, miserable as sin and basically only cheered up when everyone left (all people he knew well, too!) On top of that, I was stressed and unable to actually focus on spending time with my baby because everyone else wanted to while I was being host for that. My mum and dad (who do the most for us out of everyone) also only saw him for about 3 seconds as they were pushed out the way by in laws etc. I regret it really badly and wish I’d just kept it small and more spread out over the week/weekend. We do that now for his birthdays and tend to have a full weekend of it, but even that isn’t easy to navigate.
My youngest is a Feb baby, he had a fair few more presents (I think out of lockdown guilt!) and balloons but we only had my mum, dad, brother and his girlfriend there. He was happy as Larry all day, I think probably because we kept it small (due to restrictions) and not rushed or stressy and he was able to just play and be himself. I also felt like I saw my baby on his birthday and was able to just relax and take it easy. It also snowed and just felt like just an oddly magical day and I’ll remember it for all the good reasons, so go figure I guess.
To put this in perspective also, my friend recently just celebrated her daughters 1st birthday - they had a few presents in the morning, went on a nice sculpture walk in the afternoon and then in the evening had a takeaway. She said it was lovely. Do what feels best for you and
duck anyone else. Your daughter will feel loved whatever you do, and the fact you care so much will shine through to her bouncy castle or not.