In 2026, Japan's travel calendar is packed with national holidays and unique seasonal events that create significant travel hurdles. So, here are the key dates to avoid if you want to dodge high prices and massive crowds. January 10–12:   Coming of Age Day Weekend  ( Seijin no Hi ). This three-day weekend sees a spike in domestic travel as families celebrate new 20-year-olds. February 21–23:   Emperor’s Birthday Weekend . A guaranteed long weekend that coincides with peak ski