Question: The convention where Star Wars: X-Wing Miniatures Game was released had how many unique attendees in 2015?

Context paragraphs:
Star Wars: X-Wing Miniatures Game: Star Wars: X-Wing is a miniature war game designed by Jay Little and produced by Fantasy Flight Games that was released at Gen Con in 2012.  It features tactical ship-to-ship dogfighting between various types of starfighters set in the fictional Star Wars universe.  The game is said to be easy to learn and quick to play taking anywhere between 15 and 60 minutes from first set-up to battle's end.  Each round both players give all their ships movement orders without knowing what their opponent is doing before resolving these orders while trying to shoot down enemy craft.

Super Star Wars: Super Star Wars is a 1992 video game for the Super NES based on the 1977 film "Star Wars".  It is the SNES equivalent of the "Star Wars" NES game.  "Super Star Wars" features mostly run and gun gameplay, although it has stages which feature other challenges, such as driving a landspeeder or piloting an X-wing.  It also features multiple playable characters with different abilities.

Gen Con: Gen Con is the largest tabletop-game convention in North America by both attendance and number of events.  It features traditional pen-and-paper, board, and card games, including role-playing games, miniatures wargames, live action role-playing games, collectible card games, and strategy games. Gen Con also features computer games.  Attendees engage in a variety of tournament and interactive game sessions.  In 2015, Gen Con had 61,423 unique attendees, making it one of the largest conventions in North America.

Sterling Hershey: Sterling Hershey is a full-time architect and freelance game designer, who has worked on two different incarnations of the "Star Wars" role-playing game for both West End Games and Wizards of the Coast and also on the Star Wars Miniatures game.  He has pursued freelance writing and cartography work since the early 1990s.

Star Wars MUSH: Star Wars MUSH (commonly referred to as SW1) is a text-based online role-playing game.  "Star Wars MUSH" was created in May 1991 and was released to the public in January 1992.  The game predates the majority of ""Star Wars" expanded universe" and as such largely deviates from the established "Star Wars" universe set after "Return of the Jedi".  The game scenario system is based on the discontinued West End Games' .  The game persisted throughout the '90s as one of the net's more successful "Star Wars"-themed MUSHes, earning a feature in "The Incredible Internet Guide to Star Wars".

Star Wars Miniatures: Star Wars Miniatures is a 34mm scale collectible miniatures tabletop game based on the "Star Wars" fictional universe that was produced by Wizards of the Coast.  The game was originally released in September 2004 and continued production until May 2010.  "Star Wars Miniatures" players build point-based squads from one of ten different in-universe factions then conduct battles between those squads.  The game mechanics are a simplified version of the d20 roleplaying game system.  Multiple maps, scenarios, and set themes from different settings and time periods from within the Star Wars universe are available.

Dungeons &amp; Dragons Miniatures Game: The Dungeons & Dragons Miniatures Game is a collectible miniatures game played with pre-painted, plastic miniature figures based on characters and monsters from the "Dungeons & Dragons" game.  The figures are 30mm in scale.  Produced by Wizards of the Coast, the "Dungeons & Dragons Miniatures" line is composed of 20 loosely themed sets that were released roughly every four months since the line was launched in 2003 until its cancellation in 2011.

Attacktix: The Attacktix Battle Figure Game was a collectible action figure game produced by Hasbro released 2005 through 2006 and featuring characters from the "Star Wars", "Transformers", and Marvel Comics franchises.  Many of the action figures are sold in starter sets in quantities of five or in quantities of three in a booster pack.  Most figures average approximately 3.5 inches tall with other larger sized "mega" figures and vehicles.  The figures sport a wide variety of spring-loaded action features such as projectile launchers and swinging close combat parts.  The goal of the Attacktix game is to physically knock down the opponent's figures.  It has been compared to another miniatures game, HeroClix.

Star Wars Battle Pod: Star Wars Battle Pod is a 2014 arcade game based on the franchise "Star Wars".  It was unveiled at the New York Comic-Con on October 8, 2014.  The game consists of multiple scenarios that correspond with one of the major battles in the original trilogy.  There are five scenarios, the Battle of Yavin (Yavin) from "Star Wars" where the player is placed in an X-wing attacking the Death Star to prevent it from destroying Yavin 4, the Battle of Hoth (Hoth), from "The Empire Strikes Back", where one pilots a snowspeeder to assist in the evacuation of Hoth from invading Imperial forces, a speeder run through Endor (Endor) where one helps Han Solo make it to the shield generator to destroy the Death Star's shield for the rebels in space.  and the Battle of Endor (Death Star II) from "Return of the Jedi", which places the player in the cockpit of the "Millennium Falcon" to try to destroy the Death Star II and end the war.  There is one scenario that doesn't follow the storyline of the movies but sets its own path, (Vader's Revenge).  This scenario takes place literally seconds after the destruction of the first Death Star where one plays as Darth Vader who is trying to prevent the rebels from escaping with a piece of the Death Star with the ability to eliminate Han Solo in the process.  Another version of the game adds a scene from "The Force Awakens", where the player pilots a T-60 X-Wing to engage First Order ships on Takodana and protect General Leia's transport.

Star Wars Miniatures Battles: Star Wars Miniatures Battles is a tabletop wargame produced by West End Games in 1989 and republished in a 2nd edition version in 1990.  It was winner of the 1991 Origins Award for "Best New Miniatures Rules".  West End Games lost the license to produce any more "Star Wars" games in 1999, and the license was subsequently picked up by Wizards of the Coast the following year.  Star Wars Miniatures Battles should not be confused with WOTC's Star Wars Miniatures.

Supporting paragraphs: Star Wars: X-Wing Miniatures Game Gen Con
Answer: 61,423