Holidays
I started doing this two years ago. I read one or two chapters of Horrible Harry and the Holidaze each day before Winter Break and we do activities based on the holiday in those chapters. I have had teachers that were Jewish come in to talk about Hanukkah, our music teacher talks about Korean New Year, etc. I do send a letter home asking about the holidays our families celebrate and most of our families are Christian so they all celebrate Christmas. At the end of the letter I ask if the families would like to come in to discuss their traditions. I've only had one parent do so in the two years I've done this but she really enjoyed it and so did the kids.
The first year I did this, we had one parent complaint. I had a fifth grade teacher come down to talk to us about Hanukkah. I had to stay with her class so I wasn't there to hear what she had to say. Apparantly she was explaining to the kids that since there are people out there that don't celebrate Christmas that it would be nice if they said Happy Holidays instead of Merry Christmas to people that they don't know. The parent was pretty upset but after a while, it was forgotten.
I attached the letter that I send home. I hope it helps you out a bit!!