Israeli Memorial Day. Remembers those who died in the War of Independence and other wars in Israel. The full name of the holiday is Yom HaZikaron LeHalalei Ma’arakhot Yisrael ul’Nifge’ei Pe’ulot HaEivah (Hebrew: יוֹם הזִּכָּרוֹן לְחַלְלֵי מַעֲרָכוֹת יִשְׂרָאֵל וּלְנִפְגְעֵי פְּעֻלּוֹת הָאֵיבָה), Memorial Day for the Fallen Soldiers of the Wars of Israel and Victims of Actions of Terrorism. Although Yom Hazikaron is normally observed on the 4th of Iyyar, it may be moved earlier or postponed if observance of the holiday (or Yom HaAtzma’ut, which always follows it) would conflict with Shabbat
https://hebcal.com/h/yom-hazikaron-2024?uc=ical-jewish-holidays-all