What happens when I mark the book complete?

Mark Complete (next to Order Books) does three things:

1. Closes new submissions — nobody can add more memories.
2. Opens ordering on the project page, so anyone with the link can buy their own printed copy.
3. Emails everyone waiting — people who asked to be notified, everyone following the project, and everyone who contributed a memory — to say the book is ready to order.

If more memories come in later, you can reopen the project from the same button (or from your dashboard), edit, and mark it complete again.