I looked up what I saw a lot of my DW circle saying, "Chag sameach," and if Wikepedia is to be believed (huh, dunno) it may mean "happy holiday" and you can put the name of the holiday in the middle of the phrase if you like. But they were using it about Passover. And in fact the seders I've been kindly invited to have been very joyous, if not actually riotous, affairs.

That's worth about what you paid for it, I guess.

P.