Having an adoption party to celebrate the day in which the child entered your family, is a good bonding experience and a great way to introduce your child to extended family and friends. It will also set a date that your family can celebrate every year. This sense of tradition is important for new families to establish.
Brainstorming for an adoption party is like brainstorming for every other party. If the child has been with the family for a while, then celebrating the memories that have already been made and sharing those with your guests is something to consider.
Creating something unique to the day is also something to consider including in the party. For example, plating a tree or making a creative guest book for people to sign and for the family to look back on.
The Internet is full of really great and creative ideas to inspire your own unique adoption party. A quick search will probably yield enough ideas to plan a few. Depending on the child's age, tastes, and personality, you may want to decide on if the party will be themed, low-key, or highly ceremonial.
An adoption party is all about celebrating the first of many memories to follow as an official family. That's something you can't hang up, dance to or taste - everything else at the party is just icing on the cake.