Gender Reveal Ideas/Suggestions

I am in need of some suggestions. My husband is set on doing a gender reveal, but we are unable to make it a “party” due to it being so such notice. We will be finding out the gender before our friends and family members. Unfortunately, we are doing a sit down dinner at a restaurant and their party room is booked and we would not like to be disruptive to the other paying customers with our reveal. Would you all have any suggestions on how to still do a fun unique reveal to our family?

Side note: We are unable to change the date due to his sister being in town for that day.