Get your own personal party t-shirt.
Any one in your party can wear a t-shirt that is made for your party.
On this t-shirt you see balloons and a text area that now says “Your Text Here” just change that text to what ever you want. Maybe “Happy Birthday Party” or “Graduation class 2021” just change it so that it fits your party.
And of course there are different style shirts available so that it really fits your party.
Check out this Personal Party T-Shirt.