Possible Clues:

• May 8, 1945
• WWII surrender celebration
• May 8, 1945, briefly
• WWII observance
• 5/8/45
• 5/8/1945
• What Truman celebrated after three+ weeks as C.I.C
• Celebration that coincided with Truman turning 61
• Hindu texts Yard: 'Peace-time'?
• Occasion for much cheering in '45