Question: Where was footage from the role playing game convention in the "Fellowship of the Dice" filmed?

Context paragraphs:
Online text-based role-playing game: An online text-based role playing game is a role-playing game played online using a solely text-based interface.  Online text-based role playing games date to 1978, with the creation of "MUD1", which began the MUD heritage that culminates in today's MMORPGs.  Some online-text based role playing games are video games, but some are organized and played entirely by humans through text-based communication.  Over the years, games have used TELNET, internet forums, IRC, email and social networking websites as their media.

Marvel Heroic Roleplaying: Marvel Heroic Roleplaying (MHRP), is the fourth role playing game set in the Marvel Universe, published Margaret Weis Productions under license from Marvel Comics.  It was a fast playing game using the Cortex Plus system, with the first volume published in early 2012.  In early 2013 Margaret Weis Productions announced they would not be renewing their license.

Fellowship of the Dice: Fellowship of the Dice is a film released in 2005 (2007 on DVD), directed by Matthew Ross, and starring Aimee Graham and Price Carson.  It combines interviews and scenes from Strategicon 2004 a real-life role playing game convention with a fictional account (mockumentary) of a game with the players portrayed by actors.  As the fictional game progresses, it is intercut with interviews and scenes from the convention.

The Aethra Chronicles: The Aethra Chronicles - Volume One: Celystra's Bane or The Aethra Chronicles (also known as Aethra for short) is a classic 1994 MS-DOS shareware computer role playing game.  The game was based on the Rolemaster game system, a Pencil & Paper role playing game.  It was developed mostly as a one-man project by Michael Lawrence with some help from others for the graphics and sound/music.

Strategicon: Strategicon is a series of gaming conventions held in Southern California, focusing on role-playing games, Board Games, card games and miniatures gaming.

Cortex System: The Cortex System is a generic RPG system based on the "Sovereign Stone System ", and was developed by Margaret Weis Productions, Ltd for the Serenity Role Playing Game.  It was subsequently used for their licensed "Battlestar Galactica" and Supernatural RPGs, and brought out as a stand-alone system in the "Cortex System Role Playing Game" book (also called the "Cortex Classic System Role Playing Game").  Serenity, using the Cortex System, was the 2005 Origins Award Gamer's Choice Role Playing Game of the Year.

List of role-playing game software: Role-playing game software, as opposed to role-playing video games, is a software intended to assist in developing and running of role-playing games.  It does not allow the game to be played entirely within the computer.  Such software assist in the drawing of maps, player character and non-player character creation, generation of monsters, and provision of dice rolls and their results.  The software may be specific to a single role playing game system, or flexible enough to be applied to multiple game models.

Merpcon: MerpCon is an acronym for "Middle-Earth Role Playing Convention", a role playing game convention dedicated solely to role-playing gaming in J.R.R. Tolkien's Middle-earth.  The event is held annually on the last weekend of July and runs for 3 days from Friday, through to the end of Sunday (and sometimes a little into the following Monday morning).  To date MerpCon has been held each year in Spokane, WA, USA.  Beginning in 2009 MerpCon began to transition to being called Tolkienmoot as this convention's venue began to expand to include more Tolkien-related activities, events, and guests beyond just role playing in Middle-earth.

Theatrix (role-playing game): Theatrix is a role playing game produced by the defunct Backstage Press and no longer in print.  Primarily diceless, the game includes rules for using dice to resolve actions.  The game applies cinematic concepts to role-playing-- the players are "actors" and the GM is the "director."  The games attempts to frame adventures in the model of screenplays, which have a structured plot consisting of a number of agreed upon acts, scenes, and "pinch-points".  Players use plot points to guarantee success of an action or take minor control of the story.  This was a relatively new and controversial concept being championed by few in mainstream RPGs at the time of its release.  In addition to their numerically-rated attributes and skills, characters possess non-numerically-rated personality traits, and unrated 'descriptors'.  Descriptors can act as advantages, but in order to use them so, the player must spend plot points.  They can also act as disadvantages, and when they do so, the player gains plot points.  The game encourages collaborative roleplaying, using what it calls "Distributed Directing", whereby the players may introduce subplots though the GM remains responsible for directing the main plot.  Theatrix has many methods of resolving action and conflict without dice.  Most notabable is the use of extensive flow-charts, printed on card-stock.

Reveal Fantasia: Reveal Fantasia (リーヴェルファンタジア～マリエルと妖精物語～ , Riberu Fantajia Marieru to Yousei Monogatari ) Is a Fantasy role playing video game released in 2002 for the PlayStation 2 console by Victor Interactive Software, Inc. in Japan.  The game involved an innovative concept of a role playing game involving no battles or fighting.  Its game play shows some influence from dating simulation games.  The game was never released outside Japan.

Supporting paragraphs: Fellowship of the Dice Strategicon
Answer: Southern California