I hosted this last year and everyone seemed to enjoy themselves, so why not do it again ^_^
Basically, we go around DC and check out the 40+ embassies that are participating and learn more about the countries and their culture along with meeting some of your fellow DC redditors(You can find more information about the event here: http://www.culturaltourismdc.org/things-do-see/calendar/event/around-world-embassy-tour-0). There'll be free food, drinks(some of the alcoholic kind - remember to bring your IDs), free stuff, dancing, and overall a great time will be had.
Afterwards, we can go somewhere to chill, eat and/or drink from all the festivities and as always, if you have any ideas of what you want to do, feel free to put any ideas on the comments section.
Until then, see you guys there!