Here's a link on the science of solstice http://www.timeanddate.com/calendar/december-solstice.html
Many people celebrate throughout the world with special events to honor this day.
In Vancouver here, different parts of the city have organised workshops, lantern making etc..http://secretlantern.org/index.html
At one of the community center there's a labyrinth of light, that one can walk thru.It's a meditative walk to help release old attachments, and renew oneself as the darkest night of the year births a new season.
I love candles, and find so much peace, and serenity, when I light one.
In my hallway I have a big blue bowl with floating candles, surrounded with angel cards, and a photo of the Dalai Lama. I pick an angel card everyday , which inspires me, and sets my day on the right track, observing and meditating on the message presented to me.