Any neat ideas for a "Gender Reveal Party"?

We’re throwing a get-together with our friends and family to reveal the gender of our second child. I think it’s a great idea since we won’t be having a baby shower for the second child (generally thought of as tacky where I live) so this is an opportunity to still celebrate with our friends.

So far I have thought of having the secret envelope containing the gender sent to the bakery and asking for either a pink strawberry cake or a white cake with blue food coloring depending on the gender, along with gender neutral icing. So, everyone finds out once we cut into the cake. I could also ask everyone to wear pink or blue depending on their guess, or maybe just have a board set up where people can cast their guesses.

Do any of you have any great suggestions that you’ve seen work well?