For more casual gender reveal parties, it is common to serve finger foods such as chips and dip, mini sandwiches, and cupcakes.
It is not customary for guests to bring anything to a gender reveal party. Gifts are not expected at this time.
Ideally, the baby shower comes after the gender reveal. Since the parents typically find out the gender of the baby at around 20 weeks.
Generally, gender-neutral colors or light pastels are appropriate for gender reveals.