Once you have your space set and you know the dates, make sure to invite people in advance with a link to all the details. Since this is a Party after all, you can go all fancy with your invitations and even set a theme. The goal here is to get people excited and having them madly RSVP to attend your event. 

You can check our fancy invite post from our very own Bekka here at p2pu.org sharing our  Party for Open Education Week. 

http://blogs.p2pu.org/blog/2012/03/01/p2pu-open-ed-week-challenge-creation-party-live/

We used meetup.com to set up this event but would love to hear from you; What are other tools you might use to set up an event? Do you have any tips to getting the word out?