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I don't know what year I did, but prompted by the Trick or Treat for UNICEF ads in the comics I went door to door on Halloween collecting cash for the UN in a little wax-paper container (as well as collecting candy for myself--self-interest and civic interest are not incompatible!).  

Thanks to Lelak for archiving all of the public service ads from the Silver Age, and Jack Schiff for doing them.  

Trick or treat for UNICEF is still around, according to the web.