The first few cons weren't called BiCon, and weren't always only one per year. They were:
None of these BiCons were residential, and during this period attendance rose from about 40 to over 150. The first residential BiCon, and the first to use the now-familiar name "BiCon", was BiCon 7.
Can you give us any more information about these BiCons? We'd love to hear from you and publish your comments. (NB we don't have to show your name but if you don't give your name we will not publish your comments.) Don't forget to tell us which year your comments relate to!