Gender Reveal Party

Emily
Husband and I are expecting our 4th (actually my 4th, his 3rd). Family mentioned a baby shower but we have also discussed doing a gender reveal due to it being our 4th and last baby. Currently ours are aged 16,7 and 4. 
The question is, Iv never been to a gender reveal, what are some fun ideas to make it a fun get together? Can we find out before the reveal and just reveal to guests attending the party? Thank you in advance for sharing your ideas and photos if you have had one.