For more than half a century — a notable 52 years now — Duluth has celebrated Juneteenth, or Freedom Day. It’s the commemoration of the day in 1865 when slaves in Galveston, Texas, learned of their freedom — which was nearly three years after President Abraham Lincoln issued the Emancipation Proclamation on Sept. 22, 1862, and more than two years after it took effect on Jan. 1, 1863. Annual observances in Duluth and the Northland have been hoste…