I wish someone would invite me! I believe in the Passover and would love to attend a seder. Alas...I don't know anyone that's Jewish.
I *did*, however, participate in a Hanukkah celebration once. Many years ago, when I was working as nurse in a head trauma (long term) rehab center, I took care of a Jewish lady. I came in and found a small...I guess you would call it a "kit", with everything you needed to celebrate the lighting of the lights, including a card with what you were supposed to say each evening. So I set it all up and every evening I would light the appropriate candle (she helped with instructions) and read the section on the card for that evening. By the end of those days, all the patients in the place and most of the staff would join us and observe.
I don't know if it was valid...but it's one of my most fondest memories as a nurse. The facility was all windows on the east and west sides and we would light those candles as the sun sank behind the horizon. I'll never forget it.