**Historical event:** The Nevado del Ruiz volcano erupted in Colombia on November 13, 1985, triggering lahars that devastated the town of Armero and caused tens of thousands of deaths.
The eruption occurred on the same calendar date, but I can’t verify that it happened at **11:45 a.m.** If you mean a calendar entry for November 13, 2026, you could write: **“11:45 a.m. — Remember the victims of the Armero tragedy.”**
