congratulatory visitor's book
A book placed at celebratory events such as weddings, receptions, or New Year's greetings, where guests write congratulatory messages and sign their names.
A congratulatory visitor's book was placed at the entrance of the wedding reception hall.
Compound of 参賀 (sanga, 'congratulatory visit') and 帳 (chō, 'book/register'). The exact historical derivation is uncertain, but the term is associated with formal celebratory occasions.