Today in History (1862) - The U.S. government forbids all Union army officers from returning fugitive slaves, thus effectively annulling the Fugitive Slave Law of 1850 and setting the stage for the Emancipation Proclamation. On the same day in 1865, the Confederate Congress voted to enlist 300,000 black troops, granting them freedom with the consent of their owners. Lee surrendered a few weeks later.
The last weekend to light up in the pub, as England goes smoke-free July 1. (The graphics at the bottom of the linked page are amusing for being so pointlessly high-tech; try putting your mouse over each for several seconds.)