Should I ask my sons dad to go half on his first birthday

Me and my sons dad are separated, I've been in the process of getting child support started and finally got the ball rolling. Got a letter in the mail telling me when the first court date is set for but its set 5 days before our sons first birthday. With it only being the first court date I doubt they will have the payments set up and started within 5 days (thats if he even shows up) so can I ask his dad to go in half with me on his decorations and gifts? Or will that be something for him to use in court to get out of child support payments? Hes not bought him diapers, wipes, formula, nothing since we split but this is his first birthday and I'm going to need help throwing it and I feel like he should help out financially. I want him to go half just don't know if that would backfire on me or make it look like he "helps me" because he doesn't I just feel like surely he will want to be a part of his birthday if nothing else. We live in TN if that makes a difference. I'm honestly not sure if he would even agree to go half in the first place I just don't want to ask him unless I know it wont mess anything up in court.

EDIT: we've agreed on one party so he WILL be there. I wouldn't ask him to help pay for it if he wasnt going to be there too. I AM capable of affording it on my own and will gladly cover the costs if he decides not to help out financially. Not sure why the majority of people who commented had to be so rude or assuming. I definitely have the money to throw him a party and will gladly pay for all of it if his dad doesn’t pitch in but if he wants to help throw it, then paying for it is part of it. I feel like most of y’all were more concerned with the fact that I’m throwing my own child a first birthday party rather than answering the question I asked which was asking if him helping would effect child support or not. If you don’t believe in first birthdays, that’s fine as that’s your choice with your child but I will be throwing my child a decent party even if he “doesn’t remember it” he will enjoy it in the moment and I want to celebrate him to make memories on his birthday.