Apple’s 2010 Worldwide Developers Conference has sold out in only eight days, according to an update on the event’s dedicated website. Dates for the conference, to be held June 7-11 in its traditional venue of Moscone West in San Francisco, CA, were announced on April 28; John Gruber of Daring Fireball notes that last year’s event took a month to sell out, despite the fact that it included a number of Mac OS X and IT sessions that…