Sex reveal help

Ashanty

I am 18 weeks as of today & find out the 3rd if baby brito is a girl or a boy, so we decided to do a sex reveal party on 4th of July since we're gathering at the park anyway i have invites and decorations and a small cake but 1 PROBLEM ,

The way of doing the sex reveal it's self, i wanted sparklers or smokebombs (hard to find in MA) but My husband and I don't want anyone to know nor us, just the doctors letter and the person we're buying the supplies from.

I DO NOT want to do the cake, nor the box with the ballon inside, nor the balloon with confetti. I wanted to do something different

And of course colors will be red for girl and blue for boy.

___Share your sex-reveals___

°Ideas welcome please!