Siyum B’chorim - In commemoration of the miracle that Hashem saved the firstborn Jews from the plague of the firstborn, the firstborns fast on Tanit Bechorot, which is on Erev Pesach. First borns who join in a Siyum (conclusion of the learning of Tractate Chullin), join the Seudat Mitzvah can break the fast the rest of the day.  There will be a siyum after both the 6:15 am and 8:00 am shacharit minyanim on the morning of Friday, April 19th.