Nakba Day commemorates the 77th anniversary of a fateful event that led to decades of misery, mass death, displacement, and a horrible conflict still ongoing. You might assume that 1948 event to be the founding of the modern state of Israel, but that happened on May 14th, and today's the 15th. On May 15th 1948, this happened:
(source screenshot: Wikipedia's May-15th page at https://en.wikipedia.org/wiki/May_15#1901%E2%80%93present )