Looks like Christmas to me . . . Mountain Guardians by Rhea Mach.
'Nine Days to Christmas 'A Story of Mexico'' co-authored by Aurora Labastida and co-authored and illustrated by Marie Hall Ets (1895-1984), published in 1959, won the Caldecott medal for illustration 1960. In the story, Ceci anxiously awaits her first posada, the special Mexican Christmas party, and the opportunity to select a piñata for it.
It's June and I am posting this Christmas gem by Yuko Hosaka, gorgeous! Below a more recent collection of xmas trees and patterned Santas.