Red Carpet;

[Bapopik at AOL.COM]

   Christine Ammer's THE AMERICAN HERITAGE DICTIONARY OF IDIOMS has:

_Red carpet_  Honorary treatment, lavish hospitality, as in _We'll have to get out the red carpet for the President's visit._  This term comes from the literal practice of rolling out a carpet to welcome a royal or other esteemed guest, and indeed is often put as _roll out the red carpet._  (Early 1900s)

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MISC.
   I'm just waiting for Fred Shapiro to pull out that 1500s "new new" cite on me...I asked Hebrew Union College for any online haggadahs.  OED seems a bit off on "matzah" and "maror."