You must take many pictures and remind other people to take many pictures and make an IMPORTANT FACE.
The second most important thing about launching a new book is the CAKE.
We made one that was secretly filled with gold which spilled out when it was first cut, and it had golden marzipan piled on top and it was gilded with edible gold dust.
You also need a CROCODILE. So I crocheted one and had a raffle. As it happened, Crocodile won my friend Lily because she was best at finding hidden raffle tickets (they were mostly in books to do with GOLD).
It was so exciting that no one remembered to take any pictures.
Fortunately, Chris Riddell drew one in his Laureate Log, because he is professional that way.
It was a very good launch.