Well, its not free but if interested, you can join two days Twitter Conference in LA  for $299.
If you’re interested in joining with Alex, Ryan and a whole bunch of Twitter enthusiasts ranging from businesses to celebrities, check it out. The exact date is September 22nd-23rd, 2009, at the Skirball Cultural Center in Los Angeles. Alex and Ryan work in the platform team without which all the cool Twitter apps we use and love would not be possible. The purpose of the meet is to share information, discuss ideas, and hanging out a bit. If that’s not enough, there’s an open bar on the first night.
Stay tuned for more.