There is no entrance fee I just called and booked myself in for the 2pm event on Saturday the 12th.

The girl on the phone told me I can't book more than two tickets, so probably it's best to call and register yourself at this phone number:

020 7928 3232

Aniello

This is the url to the event: http://www.bfi.org.uk/whatson/bfi_so...of_open_source