Most or all of the sessions at BiCon are run by attendees who have a skill to share or a hot topic they want to talk about. Some facilitators have lots of experience of running groups; others are running their first session this year.
Usually sessions are offered before BiCon starts, so that the organisers can work out a timetable and print a programme with details. However, it's also common for a few more to be added as BiCon goes on – perhaps because the organisers wanted to get a sense of the BiCon vibe, or see what was already in the timetable, before making their offer, or perhaps the idea for the subject was a spin-off from a discussion during the weekend.
If you are interested in offering a session in 2011, or if you aren't sure and would like to find out more, contact Natalya at email@example.com