Pesach Sheni 2027 is observed on May 21 (14 Iyar).

Pesach Sheni means "Second Passover [Sacrifice]." It marks the day when someone who was unable to participate in the Passover offering in the proper time would observe the mitzvah exactly one month later. It is customary to mark this day by eating matzah—shmurah matzah, if possible—and by omitting Tachanun from the prayer services . . . Read more about Pesach Sheni