Second week of September: The Festival of the Milpa (Family Farm) is celebrated in Sulaco, Yoro.
September 15: Independence Day—National Holiday.
Second half of September: Town festival of Marcala [1], with religious ceremonies, street parades, food stands, carnival games, and more.
Links:
[1] http://www.moon.com/destinations/honduras/central-honduras/comayagua/marcala