The Washington Post has more:

Israel’s Ynet reported on the the party promoter’s satire:

Posting the images online to Drek’s Facebook page, the organizers wrote “as the new Islamic State gains traction in the Middle East, we at Drek have decided to give in to Sharia law and cheer the stubborn Daesh,” using the Arab acronym for the group, and invoking a veiled play on words – “stubborn” in Hebrew can be written as “hard necked,” a reference to the group’s infamous executions.

Because Islamic supremacists killing Jewish reporters is always good material for a joke?