Here is a great example of an alternative way to celebrate your centenary - with a flash mob.

I noticed an article at Ragan.com about the Swedish Medical Centre in Seattle celebrating the 100th anniversary of the non-profit healthcare service (funded by Swedish immigrants some 100 years ago).

On the Seattle hospital’s anniversary, employees were invited to gather for a group birthday photo and then some of the employees started to dance to Abba's 'Dancing Queen'. At the timeof writing this article the video on YouTube has had 18,851 views.

You will also find the hospital online:

On a microsite celebrating the 100th anniversary of the hospital - http://www.swedish100.org/our-first-100-years

On Twitter - http://twitter.com/swedish

On Facebook for the hospital - http://www.facebook.com/swedishmedicalcenter

On Facebook for with a lovely page celebrating the babies born at the hospital - http://www.facebook.com/swedishbabies