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Breakaway: The Convention

Name of a Space: 1999 convention which occurred in the United States over four days in September 1999.

1999/09/10 - 1999/09/13 (Friday thru Monday)

Culver City (Los Angeles suburb), California, United States

This is one of two conventions known to have taken place in September 1999, the month of the fictional Breakaway event (this one including the day itself), the other being Spazio 1999: Il Giorno del Distacco (in Italy).
The last of the Spacecons, put on by the original Space: 1999 Alliance, which disbanded at some point afterwards. Unverified: They had apparently been semi-quiescent for some years before, but wanting to put on this convention in September 1999.

Considering many attendees were arriving the prior day, it could be said that many were there 09/09 - 09/13, the same days as portrayed in the pilot episode of the series.