the first Wikipedia ten years ago will be held all over the world. When you do not live in Antarctica, Alaska or Greenland there is possibly a venue near you.
When there is nothing near you, it may be that the area where you live is not very much on the Wikipedia map either. Given that Wikipedia is a child of the Internet, you can celebrate with us by putting where you live on the map. You can do this by writing in your Wikipedia or making pictures available on Commons.
I hope you will join us in celebrating our ongoing endeavour to share knowledge with everyone.