From the website:
World AIDS Day is about people getting the facts about HIV and AIDS. It's a day for people to get involved and there are many ways in which you can do so. We have a listing of events where you can search to find the ones that suit you, or if you are organising an event, you can add details of your event. If you would like to get involved in other ways, we have some great ideas for you!
Here's another site with info - it's connected to the ONE Campaign.
Evangelicals are getting involved - read about it here.