My boys' birthdays are 12 days apart and in the middle of summer. Our parties usually consist of my parents and brothers and their girlfriends.
They have a couple of friends over and we usually go to the pool and have cake and ice cream
why does there need to be a big party?
perhaps your ex is planning a party at some point as I am sure she would want to acknowledge your daughter's birthday but she just isn't telling you all the big plans
I guess I don't understand where your dilemna is...
you weren't going to invite her to the hanging of the banners and to legoland...why would you assume she would share any of the birthday plans she may or may not have made with you
and
be careful of becoming the Disney dad and giving your daughter everything she asks for...