In December, 1975 the Los Angeles Science Fantasy Society prepared LA 2000, a special convention to celebrate the club's 2,000th meeting.   This was more a relaxicon than a standard convention (since it did not have guests of honor or a formal program).  

LA 2000 was so enjoyable that the event was repeated in 1976, but in October, to honor the club's anniversary and, for the first time, it was called LOSCON.  

Loscon was held twice in 1977, the second that year being the first Loscon with an official guest of honor, Dr. Jerry Pournelle.  

In 1978 Loscon was held in November and stayed in that month thereafter.  

LOSCON 7 in 1980 was the first to have over a thousand members, and attendance has not dropped below a thousand since 1984.  

Starting with LOSCON 9 in 1982, Loscon was held over the Thanksgiving weekend and that became the traditional date.  

LOSCON was held in Pasadena from 1983 through 1989, in Burbank from 1993 through 2003, and in 2004 it returned to Los Angeles, in an LAX area hotel.

The LASFS website has begun an archive of material about past Loscons .

The following is a guide to the history of the Los Angeles Regional  Science Fiction and Fantasy Convention (Loscon)   The numbers in parentheses indicate total members followed by actual attending members.  Convention themes are also named for those conventions that had themes