The official theme for this year is "Women and men united to end violence against women and girls." Historically, however, many locales have adapted the theme to make it more relevant to the circumstances in their areas of the world. In 2008, there were 684 events in 56 countries. So far this year, 514 events are scheduled in 40 countries.
To find out what's happening anywhere in the world, click here. If you want to plan an event of your own, you can upload it here to encourage others to attend. If all else fails, consider gathering with friends and being thankful for the good company that you keep.