Halocho #1327- What is Isru Chag?

The day after Pessach, Sukkoth and Shavuoth is called אִסְרוּ חַג .

That would be today (Tuesday) in Israel and Wednesday everywhere else.

Various reasons are given for Isru Chag after Pessach and Sukkoth.

On Isru Chag the custom is to eat a larger meal than usual. Nobody - not even a bride and groom on their wedding day, nor a Yahrzeit - may fast on Isru Chag.

One does not say Tachanun on Isru Chag. Some communities don't say לַמְנַצֵּחַ (before וּבָא לְצִיּוֹן  in Shacharit) on אִסְרוּ חַג .

Source: Kitzur Shulchan Aruch 22:8, 103:14, 146:2

- Danny, in Jerusalem
Tuesday  ,  23 Nissan 5774 - 8th day of the Omer, אִסְרוּ חַג

Please daven for 3 year old נָעֳמִי בַּת דִינָה who is being treated for lymphoma