Open a guestbook that has been given to read its messages as a book. Use the page-turn controls to move through the words, photos, video and voice notes. Use the details control to return to the guestbook’s conversation and available actions.
A guestbook for one person stays hidden from that person until it is given. Adding a cover photo or reading it as a book does not change that rule. Automatic birthday books give themselves on the day; a hand-started book waits for its creator to give it.
For an event with shared moments, open its recap to turn through the day together. This uses the moments shared with the event; it does not create a public link or open the group to other people.