Here's the detail of this event: http://www.startupsocials.com/san-francisco-october-10th-2013.html?utm_source=everycircle&utm_medium=newsletter&utm_campaign=party_october. I did buy an extra ticket. So the first person who RSVP for this event will attend this event for free.
I'm more interested in the networking part of this event. So I personally will only stay until 9 or 9:30 or so. But if you are also bringing friends to this event, feel free to stay longer and have fun!