Yom HaZikaron
Begins at sundown on Monday, 27 April 2020 (4th of Iyyar, 5780)
Israeli Memorial Day. 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.
Source hebcal