Christmas Advent Calendar Book

FIG. 1 is a top, front, right side perspective view of a Christmas advent calendar book showing my new design; FIG. 2 is a top, rear, left side perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side elevational view thereof; FIG. 6 is a right side elevational view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is an enlarged view of portion 9 in FIG. 1 ; FIG. 10 is an enlarged view of portion 10 in FIG. 1 ; FIG. 11 is an enlarged view of portion 11 in FIG. 1 ; and, FIG. 12 is an enlarged view of portion 12 in FIG. 1 . The broken lines show the features of the Christmas advent calendar book that form no part of the claimed design. The dash-dot-dash broken lines define the boundary of enlarged views and form no part of the claimed design.