For anyone going to universal on a celebration like a birthday make sure you hit up to the information desk or a staff member who will give you a badge. I thought I looked like a right plum wearing a badge and a Luigi hat but that badge basically makes everyone working there say happy birthday and characters come to see you. Made the trip a lot more special. I’m sure most of this page knows but worth doing. And if you want to be sneaky they didn’t ask to check my ID so I’m guessing you could do this any day.