October has a surprise: World Thrombosis Day lands on October 13, 2027.

World Thrombosis Day is celebrated on October 13, 2026.

June has a surprise: World Tessellation Day lands on June 17, 2027.

Mark your calendar: May 17, 2027 is World Information Society Day.

May has a surprise: World Information Society Day lands on May 17, 2026.

March 30, 2027 brings World Tb-303 Appreciation day — one of spring's more delightful excuses to celebrate.

March 30, 2026 brings World Tb-303 Appreciation day — one of spring's more delightful excuses to celebrate.

April 24, 2027 brings World Tai Chi and Qigong Day — one of spring's more delightful excuses to celebrate.

It's World Tai Chi and Qigong Day on April 24, 2026.