Am I being unreasonable?

Don’t judge me too much that I’m already semi planning little ones 1st Birthday (29th October) 😂 I’m due to have an operation next weekend, then her Christening the following weekend, then going back to work but a new job so I thought if I semi plan it now I’m being prepared. I’m not doing a party as it’s just too much aggravation for a first birthday as she has no baby friends and there’s minimal young children in the families. It’s our first child and his families first grandchild. I said to my partner about doing whatever on the Saturday (28th) with his family as they’re huge (3 siblings&partners, parents, many aunts/uncles/cousins), plus his friends so it can be their day to celebrate with us/her. Then on the Sunday which is her actual birthday, taking her to the zoo or aquarium so it’s a family day out just the 3 of us, then in the evening have my family over (parents, sister with brother in law and 2 nephews) so we have a day to celebrate. He was all up for this idea but then soon backtracked and said “mum and dad will probably want to see her on her actual birthday” - but they would’ve had a whole day on the Saturday with her (well probably 11am-4pm time frame, baring in mind they currently only see her for 2 hours once a week, will be increasing to 6 when I go back to work, plus possible weekend visits) and I put my foot down on it because they would’ve had the Saturday for celebrating her birthday then we would end up spending at least an hour there on the Sunday too… Am I being unreasonable on this ? Wanted to see other mums opinions