What can I do to surprise him

Cassie • 🎉🎃🍁🍂 blessed with a beautiful 3 year old boy a 2 year girl and a 9 week girl👨‍👩‍👧‍👦
OK so I have my scan in two weeks and unfortunately my partner can't make it as he has to work, my mother in law is coming instead my partner won't know the sex of our baby on the day, it's fathers day June something so what I wanna do is a gender reveal on fathers day as a present from his child, also his first born son will be giving daddy a present for fathers day to. Does anyone have any ideas to hand please