PAX originally known as Penny Arcade Expo is a overall term to refer to series of gaming festivals which includes Tabletop, Arcade, computer and video gaming. The festival is held annually in Seattle Washington, Boston, Massachusetts, San Antonia, Texas, Philadelphia, Pennsylvania and Melbourne, Victoria. PAX was created by Jerry Holkins and Mike Krahulik.
PAX was first held in 2004 there is LAN multilayer game tournaments from independent and major gaming companies. PAX is a current gaming event and is held every year it gets around 70.000 to 80.000 people each year and was created in Washington state.
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https://en.wikipedia.org/wiki/PAX_(event) (info used 1.12.17)