Congress has designated the last Monday in May as Memorial Day. President Biden last week issued A Proclamation on Prayer For Peace, Memorial Day, 2023 (full text). It reads in part:
On Memorial Day, we honor America’s beloved daughters and sons who gave their last full measure of devotion to this Nation....
In honor and recognition of all of our fallen service members, the Congress, by a joint resolution approved May 11, 1950, as amended (36 U.S.C. 116), has requested that the President issue a proclamation calling on the people of the United States to observe each Memorial Day as a day of prayer for permanent peace and designating a period on that day when the people of the United States might unite in prayer and reflection. The Congress, by Public Law 106-579, has also designated 3:00 p.m. local time on that day as a time for all Americans to observe, in their own way, the National Moment of Remembrance.
NOW, THEREFORE, I, JOSEPH R. BIDEN JR., President of the United States of America, do hereby proclaim Memorial Day, May 29, 2023, as a day of prayer for permanent peace, and I designate the hour beginning in each locality at 11:00 a.m. of that day as a time when people might unite in prayer and reflection.