It is not an exaggeration to say that Linux is at the center of the open source movement. So it is not unusual (in fact, quite common) for many open source events to bear the Linux name, when in the majority of the cases they embrace the wider ecosystem that encompasses an ample variety of open source software projects.
One such event is the Linux Picnic, also known as Picn*x, an outdoors community gathering held every year to celebrate all the accomplishments of Open Source Software since the release of the first Linux kernel in August 1991. Picn*x 19 is scheduled to be held in the San Francisco South Bay Area on Saturday August 21st, at the Sunnyvale Baylands Park, and you can expect Haiku to be there.