It looks like you didn't even glance at that article I linked,
Addie. There were more than double the patriots that mustered in Worcester than eventually showed up in Lexington and Concord. The Worcester event was organized "... to close the courts, the outposts of British authority in this far reach of the Empire." They were successful in "the insurgents forced two dozen court officials to walk the gauntlet, hats in hand, reciting their recantations more than thirty times each so everyone could hear. The wording was strong: the officials would cede to the will of the people and promise never to execute “the unconstitutional act of the British parliament” (the Massachusetts Government Act) that would “reduce the inhabitants … to mere arbitrary power.” With this humiliating submission, all British authority vanished from Worcester County, never to return."
This type of uprising happened from Worcester county and all the way throughout the western shiretowns of MA. Even Salem and Plymouth were able to clean house. Drove all those British officials out for an eventual showdown in Concord - where, apparently, the militia didn't plan as well and had to muster in a hurry. It was then that blood was shed. So as you can see, the revolution began in Worcester, but the war started in Concord.
I guess Boston got its date picked for celebrating because it had a better press agent than Worcester...