Originally Posted by Wiki on E3
Presented by the Entertainment Software Association, the Electronic Entertainment Expo, commonly known and composed as E3 (besides the organiser’s usage of E³, the superscript version is rarely used), is the world's largest annual trade show for the computer and video games industry. The expo is a strictly over-18 event, it is only open to game industry professionals, journalists, and guests of exhibitors, such as celebrities.
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So there you go, E3 is for people in the gaming industry and related fields in video gaming.
Sauce:
http://en.wikipedia.org/wiki/E3
There's nowhere I can't reach.