So I won't be having a traditional baby shower. I'm throwing a "Trezelle's grand announcement"…

So I won't be having a traditional baby shower. I'm throwing a "Trezelle's grand announcement" dinner. Not many people know that I'm pregnant so it's also a surprise of sorts. I plan to send out formal invites and also instruct that they bring a gift of their choosing that would fit what they think my announcement will be. I have lots of ideas but I need more. Has anyone done this before? I'm also working on my vision board as I type..