Has anyone had one of these?

Roughly when should it be done?

And did you do anything different at yours that made it fun?

So, my bf works across the country and he is not gonna be here for the ultrasound that reveals the gender. So, I thought about doing a gender reveal, instead of a baby shower since we have other children. My oldest who is 14 and my neice who is 19 have both said they wanna help set it up. I'll do the simple stuff like food and such but they wanna do the cake and balloons and such.